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 * Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
 * Copyright (C) INRIA - Fabrice Leray
 * Copyright (C) 2012 - 2016 - Scilab Enterprises
 * Copyright (C) 2018 - 2019 - Samuel GOUGEON
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 * pursuant to article 5.3.4 of the CeCILL v.2.1.
 * This file was originally licensed under the terms of the CeCILL v2.1,
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<refentry xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink"
          xmlns:svg="http://www.w3.org/2000/svg" xmlns:mml="http://www.w3.org/1998/Math/MathML"
          xmlns:db="http://docbook.org/ns/docbook" xmlns:scilab="http://www.scilab.org"
          xml:lang="en" xml:id="plot">
    <refnamediv>
        <refname>plot</refname>
        <refpurpose>2D plot</refpurpose>
    </refnamediv>
    <refsynopsisdiv>
        <title>Syntax</title>
        <synopsis>
            plot     // demo
            plot(y)
            plot(x, y)
            plot(x, fun)
            plot(x, list(fun, param))
            plot(.., LineSpec)
            plot(.., LineSpec, GlobalProperty)
            plot(x1, y1, LineSpec1, x2,y2,LineSpec2,...xN, yN, LineSpecN, GlobalProperty1,.. GlobalPropertyM)
            plot(x1,fun1,LineSpec1, x2,y2,LineSpec2,...xN,funN,LineSpecN, GlobalProperty1, ..GlobalPropertyM)
            plot(logflag,...)
            plot(axes_handle,...)
        </synopsis>
    </refsynopsisdiv>
    <refsection>
        <title>Arguments</title>
        <variablelist>
            <varlistentry>
                <term>x</term>
                <listitem>
                    <para>
                        vector or matrix of real numbers or integers. If omitted, it is assumed
                        to be the vector <literal>1:n</literal> where <literal>n</literal> is the
                        number of curve points given by the <literal>y</literal> parameter.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>y</term>
                <listitem>
                    <para>
                        vector or matrix of real numbers or of integers.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>fun, fun1, ..</term>
                <listitem>
                    <para>
                        handle of a function, as in <literal>plot(x, sin)</literal>.
                    </para>
                    <para>
                        If the function to plot needs some parameters as input arguments, the
                        function and its parameters can be specified through a list, as in
                        <literal>plot(x, list(delip, -0.4))</literal>
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>LineSpec</term>
                <listitem>
                    <para>This optional argument must be a string that will be used as a
                        shortcut to specify a way of drawing a line. We can have one
                        <literal>LineSpec</literal> per <literal>y</literal> or <literal>{x,y}</literal>
                        previously entered. <literal>LineSpec</literal> options deals with
                        LineStyle, Marker and Color specifiers (see <link linkend="LineSpec">LineSpec</link>).
                        Those specifiers determine the line style, mark style and color of
                        the plotted lines.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>GlobalProperty</term>
                <listitem>
                    <para>This optional argument represents a sequence of couple
                        statements <literal>{PropertyName,PropertyValue}</literal> that defines
                        global objects' properties applied to all the curves created by this
                        plot. For a complete view of the available properties (see
                        <link linkend="GlobalProperty">GlobalProperty</link>).
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>logflag</term>
                <listitem>
                    <para>
                        "ln" | "nl" | "ll" : 2-character word made of "l" standing for
                        "<emphasis role="bold">L</emphasis>ogarithmic" or/and "n" standing for
                        "<emphasis role="bold">N</emphasis>ormal". The first character applies to
                        the X axis, the second to the Y axis. Hence, "ln" means that the X axis
                        is logarithmic and the Y axis is normal. The default is "nn":
                        both axes in normal scales.
                    </para>
                    <para>
                        <literal>logflag</literal> must be used after <literal>axes_handle</literal>
                        (if any) and before the first curve's data <literal>x</literal> or
                        <literal>y</literal> or <literal>fun</literal>.
                        It applies to all curves drawn by the <literal>plot(…)</literal> instruction.
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>axes_handle</term>
                <listitem>
                    <para>This optional argument forces the plot to appear inside the
                        selected axes given by <literal>axes_handle</literal> rather than the
                        current axes (see <link linkend="gca">gca</link>).
                    </para>
                </listitem>
            </varlistentry>
        </variablelist>
    </refsection>
    <refsection>
        <title>Description</title>
        <para>
            <literal>plot</literal> plots a set of 2D curves. <literal>plot</literal> has been
            rebuild to better handle Matlab syntax. To improve graphical
            compatibility, Matlab users should use <literal>plot</literal> (rather than
            <link linkend="plot2d">plot2d</link>).
        </para>
        <para>Data entry specification :</para>
        <para>In this paragraph and to be more clear, we won't mention
            <literal>LineSpec</literal> nor <literal>GlobalProperty</literal> optional arguments
            as they do not interfere with entry data (except for <literal>"Xdata"</literal>,
            <literal>"Ydata"</literal> and <literal>"Zdata"</literal> property, see
            <link linkend="GlobalProperty">GlobalProperty</link>). It is assumed that all those optional
            arguments could be present too.
        </para>
        <para>
            If <literal>y</literal> is a vector, plot(y) plots vector <literal>y</literal>
            versus vector <literal>1:size(y,'*')</literal>.
        </para>
        <para>
            If <literal>y</literal> is a matrix, plot(y) plots each columns of
            <literal>y</literal> versus vector <literal>1:size(y,1)</literal>.
        </para>
        <para>
            If <literal>x</literal> and <literal>y</literal> are vectors, plot(x,y) plots
            vector <literal>y</literal> versus vector <literal>x</literal>. <literal>x</literal> and
            <literal>y</literal> vectors should have the same number of entries.
        </para>
        <para>
            If <literal>x</literal> is a vector and <literal>y</literal> a matrix plot(x,y)
            plots each columns of <literal>y</literal> versus vector <literal>x</literal>. In this
            case the number of columns of <literal>y</literal> should be equal to the number
            of <literal>x</literal> entries.
        </para>
        <para>
            If <literal>x</literal> and <literal>y</literal> are matrices, plot(x,y) plots each
            columns of <literal>y</literal> versus corresponding column of <literal>x</literal>.
            In this case the <literal>x</literal> and <literal>y</literal> sizes should be the
            same.
        </para>
        <para>
            Finally, if only <literal>x</literal> or <literal>y</literal> is a matrix, the
            vector is plotted versus the rows or columns of the matrix. The choice is
            made depending on whether the vector's row or column dimension matches the
            matrix row or column dimension. In case of a square matrix (on
            <literal>x</literal> or <literal>y</literal> only), priority is given to columns
            rather than lines (see examples below).
        </para>
        <para>
            <warning>
                When it is necessary and possible, <literal>plot</literal> transposes
                <literal>x</literal> and <literal>y</literal>,
                to get compatible dimensions; a warning is then issued. For instance,
                when <literal>x</literal> has as many rows as <literal>y</literal> has columns.
                If <literal>y</literal> is square, it is never transposed.
            </warning>
        </para>
        <para>
            <literal>y</literal> can also be a function defined as a macro or a
            primitive. In this case, <literal>x</literal> data must be given (as a vector or
            matrix) and the corresponding computation <literal>y(x)</literal> is done
            implicitly.
        </para>
        <para>
            The <literal>LineSpec</literal> and <literal>GlobalProperty</literal> arguments
            should be used to customize the plot. Here is a complete list of the
            available options.
        </para>
        <variablelist>
            <varlistentry>
                <term>LineSpec</term>
                <listitem>
                    <para>This option may be used to specify, in a short and easy manner,
                        how the curves are drawn. It must always be a string containing
                        references to LineStyle, Marker and Color specifiers.
                    </para>
                    <para>These references must be set inside the string (order is not
                        important) in an unambiguous way. For example, to specify a red
                        long-dashed line with the diamond mark enabled, you can write :
                        <literal>'r--d'</literal> or <literal>'--dire'</literal> or
                        <literal>'--reddiam'</literal> or another unambiguous statement... or to be
                        totally complete <literal>'diamondred--'</literal> (see
                        <link linkend="LineSpec">LineSpec</link>).
                    </para>
                    <para>Note that the line style and color, marks color (and sizes) can
                        also be (re-)set through the polyline entity properties (see
                        <link linkend="polyline_properties">polyline_properties</link>).
                    </para>
                </listitem>
            </varlistentry>
            <varlistentry>
                <term>GlobalProperty</term>
                <listitem>
                    <para>This option may be used to specify how all the curves are
                        plotted using more option than via <literal>LineSpec</literal>. It must
                        always be a couple statement constituted of a string defining the
                        <literal>PropertyName</literal>, and its associated value
                        <literal>PropertyValue</literal> (which can be a string or an integer or...
                        as well depending on the type of the <literal>PropertyName</literal>). Using
                        <literal>GlobalProperty</literal>, you can set multiple properties : every
                        properties available via LineSpec and more : the marker color
                        (foreground and background), the visibility, clipping and thickness of
                        the curves. (see <link linkend="GlobalProperty">GlobalProperty</link>)
                    </para>
                    <para>Note that all these properties can be (re-)set through the
                        polyline entity properties (see <link linkend="polyline_properties">polyline_properties</link>).
                    </para>
                </listitem>
            </varlistentry>
        </variablelist>
    </refsection>
    <refsection>
        <title>Remarks</title>
        <para>By default, successive plots are superposed. To clear the previous
            plot, use <literal>clf()</literal>. To enable <literal>auto_clear</literal> mode as
            the default mode, edit your default axes doing:
        </para>
        <para>da=gda();</para>
        <para>da.auto_clear = 'on'</para>
        <para>
            For a better display <literal>plot</literal> function may modify the <literal>box</literal> property of
            its parent Axes. This happens when the parent Axes were created by the call to <literal>plot</literal> or were empty
            before the call. If one of the axis is centered at origin,
            the box is disabled.
            Otherwise, the box is enabled.
        </para>
        <para>
            For more information about box property and axis positioning see <link linkend="axes_properties">axes_properties</link>
        </para>
        <para>A default color table is used to color plotted curves if you do not
            specify a color. When drawing multiple lines, the plot command
            automatically cycles through this table. Here are the used colors:
        </para>
        <informaltable border="1">
            <tr>
                <th> <literal>R</literal> </th>
                <th> <literal>G</literal> </th>
                <th> <literal>B</literal> </th>
            </tr>
            <tr> <td>0.</td>   <td>0.</td>   <td>1.</td>   </tr>
            <tr> <td>0.</td>   <td>0.5</td>  <td>0.</td>   </tr>
            <tr> <td>1.</td>   <td>0.</td>   <td>0.</td>   </tr>
            <tr> <td>0.</td>   <td>0.75</td> <td>0.75</td> </tr>
            <tr> <td>0.75</td> <td>0.</td>   <td>0.75</td> </tr>
            <tr> <td>0.75</td> <td>0.75</td> <td>0.</td>   </tr>
            <tr> <td>0.25</td> <td>0.25</td> <td>0.25</td> </tr>
        </informaltable>
        <para/>
        <para>
            Enter the command <literal>plot</literal> to see a demo.
        </para>
    </refsection>
    <refsection>
        <title>Examples</title>
        <para>
            <emphasis role="bold">Choosing the normal or logarithmic plotting mode:</emphasis>
        </para>
        <programlisting role="example"><![CDATA[
set(gda(), "grid_style",[7 7], "grid", [1 1]*color("grey70"));
title(gda(), "fontsize", 3, "color", "lightseagreen", "fontname", "helvetica bold");

x = linspace(1e-1,100,1000);
xm = 35;
dx = 17;
G = exp(-((x-xm)/dx).^2/2)*30;

scf(1); clf
subplot(2,2,1), plot(x, G),       title("plot(x, y)")
subplot(2,2,2), plot("ln", x, G), title("semilog-x : plot(""ln"", x, y)")
gca().sub_ticks(1) = 8;
subplot(2,2,3), plot("nl", x, G), title("semilog-y : plot(""nl"", x, y)")
gca().sub_ticks(2) = 8;
subplot(2,2,4), plot("ll", x, G), title("loglog : plot(""ll"", x, y)")
gca().sub_ticks = [8 8];

sda();
 ]]></programlisting>
        <scilab:image>
            title(gda(), "", "fontsize", 3, "color", "lightseagreen", "fontname", "helvetica bold");
            set(gda(), "grid_style",[7 7], "grid", [1 1]*color("grey70"));

            x = linspace(1e-1,100,1000);
            xm = 35;
            dx = 17;
            G = exp(-((x-xm)/dx).^2/2)*30;
            scf(1); clf
            subplot(2,2,1), plot(x, G),       title("plot(x, y)")
            subplot(2,2,2), plot("ln", x, G), title("semilog-x : plot(""ln"", x, y)")
            gca().sub_ticks(1) = 8;
            subplot(2,2,3), plot("nl", x, G), title("semilog-y : plot(""nl"", x, y)")
            gca().sub_ticks(2) = 8;
            subplot(2,2,4), plot("ll", x, G), title("loglog : plot(""ll"", x, y)")
            gca().sub_ticks = [8 8];

            gcf().axes_size = [750 520];
            sda();
        </scilab:image>
        <para/>
        <para>
            <emphasis role="bold">Simple plot of a single curve:</emphasis>
        </para>
        <programlisting role="example"><![CDATA[
// Default abscissae = indices
subplot(1,2,1)
plot(sin(0:0.1:2*%pi))
xlabel("x indices")

// With explicit abscissae:
x = [0:0.1:2*%pi]';
subplot(1,2,2)
plot(x, sin(x))
xlabel("Specified abscissae")
 ]]></programlisting>
        <scilab:image>
            // Default abscissae = indices
            subplot(1,2,1)
            plot(sin(0:0.1:2*%pi))
            xlabel("x indices")

            // With explicit abscissae:
            x = [0:0.1:2*%pi]';
            subplot(1,2,2)
            plot(x, sin(x))
            xlabel("Specified abscissae")

            gcf().axes_size = [700 350];
        </scilab:image>
        <para/>
        <para>
            <emphasis role="bold">Multiple curves with shared abscissae:</emphasis>
            Y: 1 column = 1 curve:
        </para>
        <programlisting role="example"><![CDATA[
clf()
x = [0:0.1:2*%pi]';
plot(x, [sin(x) sin(2*x) sin(3*x)])
 ]]></programlisting>
        <scilab:image>
            x=[0:0.1:2*%pi]';
            plot(x,[sin(x) sin(2*x) sin(3*x)])

            gcf().axes_size = [700 350];
        </scilab:image>
        <para/>
        <para>
            <emphasis role="bold">
                Specifying a macro or a builtin instead of explicit ordinates:
            </emphasis>
        </para>
        <programlisting role="example"><![CDATA[
clf
subplot(2,2,1)         // sin() is a builtin
plot(1:0.1:10, sin)    // <=> plot(1:0.1:10, sin(1:0.1:10))
title("plot(x, sin)", "fontsize",3)

// with a macro:
deff('y = myFun(x)','y = x + rand(x)')
subplot(2,2,2)
plot(-3:0.1:5, myFun)
title("plot(x, myFun)", "fontsize",3)

// With functions with parameters:
subplot(2,2,3)
plot(1:0.05:7, list(delip, -0.4))  // <=> plot(1:0.05:7, delip(1:0.05:7,-0.4) )
title("plot(x, list(delip,-0.4))", "fontsize",3)

function Y = myPow(x,p)
    [X,P] = ndgrid(x,p);
    Y = X.^P;
    m = max(abs(Y),"r");
    for i = 1:size(Y,2)
        Y(:,i) = Y(:,i)/m(i);
    end
endfunction
x = -5:0.1:6;
subplot(2,2,4)
plot(x, list(myPow,1:5))
title("plot(x, list(myPow,1:5))", "fontsize",3)
 ]]></programlisting>
        <scilab:image><![CDATA[
            subplot(2,2,1)         // sin() is a builtin
            plot(1:0.1:10, sin)    // <=> plot(1:0.1:10, sin(1:0.1:10))
            title("plot(x,sin)", "fontsize",3)

            // with a macro:
            deff('y = myFun(x)','y = x + rand(x)')
            subplot(2,2,2)
            plot(-3:0.1:5, myFun)
            title("plot(x, myFun)", "fontsize",3)

            // With functions with parameters:
            subplot(2,2,3)
            plot(1:0.05:7, list(delip, -0.4))  // <=> plot(1:0.05:7, delip(1:0.05:7,-0.4) )
            title("plot(x, list(delip,-0.4))", "fontsize",3)

            function Y = myPow(x,p)
                [X,P] = ndgrid(x,p);
                Y = X.^P;
                m = max(abs(Y),"r");
                for i = 1:size(Y,2)
                    Y(:,i) = Y(:,i)/m(i);
                end
            endfunction
            x = -5:0.1:6;
            subplot(2,2,4)
            plot(x, list(myPow,1:5))
            title("plot(x, list(myPow,1:5))", "fontsize",3)

            gcf().axes_size = [730 500];
        ]]></scilab:image>
        <para/>
        <para>
            <emphasis role="bold">Setting curves simple styles when calling plot():</emphasis>
        </para>
        <programlisting role="example"><![CDATA[
clf
t = -%pi:%pi/20:2*%pi;
// sin() : in Red, with O marks, without line
// cos() : in Green, with + marks, with a solid line
// gaussian: in Blue, without marks, with dotted line
gauss = 1.5*exp(-(t/2-1).^2)-1;

plot(t,sin,'ro', t,cos,'g+-', t,gauss,':b')
 ]]></programlisting>
        <scilab:image><![CDATA[
            t = -%pi:%pi/20:2*%pi;
            // sin() : in Red, with O marks, without line
            // cos() : in Green, with + marks, with a solid line
            // gaussian: in Blue, without marks, with dotted line
            gauss = 1.5*exp(-(t/2-1).^2)-1;

            plot(t,sin,'ro', t,cos,'g+-', t,gauss,':b')

            gcf().axes_size = [800 400];
        ]]>
        </scilab:image>
        <para/>
        <para>
        Vertical segments between two curves, with automatic colors, and using Global properties
        for markers styles. Targeting a defined axes.
        </para>
        <programlisting role="example"><![CDATA[
clf
subplot(1,3,3)
ax3 = gca();         // We will draw here later
xsetech([0 0 0.7 1]) // Defines the first Axes area
t = -3:%pi/20:7;
// Tuning markers properties
plot([t ;t],[sin(t) ;cos(t)],'marker','d','markerFaceColor','green','markerEdgeColor','yel')

// Targeting a defined axes
plot(ax3, t, sin)
 ]]></programlisting>
        <scilab:image><![CDATA[
            clf
            subplot(1,3,3)
            ax3 = gca();         // We will draw here later
            xsetech([0 0 0.7 1]) // Defines the first Axes area
            t = -3:%pi/20:7;
            // Tuning markers properties
            plot([t ;t],[sin(t) ;cos(t)],'marker','d','markerFaceColor','green','markerEdgeColor','yel')

            // Targeting a defined axes
            plot(ax3, t, sin)

            gcf().axes_size = [800 400];
        ]]>
        </scilab:image>
        <para/>
        <para/>
        <para>
            <emphasis role="bold">Case of a non-square Y matrix:</emphasis>
            When it is consistent and required, X or/and Y data are
            automatically transposed in order to become plottable.
        </para>
        <programlisting role="example"><![CDATA[
clf()
x = [5 6 7 8]
y = [1   1   1   1   8
     2   3   4   5   9
     3   4   5   6  10
     4   5   6   7  12];

// Only one matching possibility case: how to make 4 identical plots in 4 manners...
// x is 1x4 (vector) and y is 4x5 (non square matrix)
subplot(221); plot(x', y , "o-");    // OK as is
subplot(222); plot(x , y , "o-");    // x is transposed
subplot(223); plot(x', y', "o-");    // y is transposed
subplot(224); plot(x , y', "o-");    // x and y are transposed
 ]]></programlisting>
        <scilab:image>
            x = [5 6 7 8]
            y = [1   1   1   1   8
                 2   3   4   5   9
                 3   4   5   6  10
                 4   5   6   7  12];

            // Only one matching possibility case: how to make 4 identical plots in 4 manners...
            // x is 1x4 (vector) and y is 4x5 (non square matrix)
            subplot(221); plot(x', y , "o-");    // OK as is
            subplot(222); plot(x , y , "o-");    // x is transposed
            subplot(223); plot(x', y', "o-");    // y is transposed
            subplot(224); plot(x , y', "o-");    // x and y are transposed
        </scilab:image>
        <para>
            <emphasis role="bold">Case of a square Y matrix, and X implicit or square:</emphasis>
        </para>
        <programlisting role="example"><![CDATA[
clf
t = [1   1   1   1
     2   3   4   5
     3   4   5   6
     4   5   6   7];

subplot(231), plot(t,"o-") , title("plot(t)",  "fontsize",3)
subplot(234), plot(t',"o-"), title("plot(t'')", "fontsize",3)

subplot(232), plot(t,t,"o-") , title("plot(t, t)",  "fontsize",3)
subplot(233), plot(t,t',"o-"), title("plot(t,t'')", "fontsize",3)

subplot(235), plot(t', t,"o-"),  title("plot(t'', t)",   "fontsize",3)
subplot(236), plot(t', t',"o-"), title("plot(t'', t'')", "fontsize",3)

for i=1:6, gcf().children(i).data_bounds([1 3]) = 0.5; end
 ]]></programlisting>
        <scilab:image>
            clf
            t = [1   1   1   1
                 2   3   4   5
                 3   4   5   6
                 4   5   6   7];

            subplot(231), plot(t,"o-") , title("plot(t)",  "fontsize",3)
            subplot(234), plot(t',"o-"), title("plot(t'')", "fontsize",3)

            subplot(232), plot(t,t,"o-") , title("plot(t, t)",  "fontsize",3)
            subplot(233), plot(t,t',"o-"), title("plot(t,t'')", "fontsize",3)

            subplot(235), plot(t', t,"o-"),  title("plot(t'', t)",   "fontsize",3)
            subplot(236), plot(t', t',"o-"), title("plot(t'', t'')", "fontsize",3)

            for i=1:6, gcf().children(i).data_bounds([1 3]) = 0.5; end

            gcf().axes_size = [800 450];
        </scilab:image>
        <para/>
        <para>
            <emphasis role="bold">Special cases of a matrix X and a vector Y:</emphasis>
        </para>
        <programlisting role="example"><![CDATA[
clf
X = [1   1   1   1
     2   3   4   5
     3   4   5   6
     4   5   6   7];
y = [1 2 3 4];

subplot(221), plot(X, y,  "o-"), title("plot(X, row)",  "fontsize",3)
        // equivalent to plot(t, [1 1 1 1; 2 2 2 2; 3 3 3 3; 4 4 4 4])
subplot(223), plot(X, y', "o-"), title("plot(X, col)  (row = col'')",  "fontsize",3)
subplot(222), plot(X',y,  "o-"), title("plot(X'', row)",  "fontsize",3)
subplot(224), plot(X',y', "o-"), title("plot(X'', col)  (row = col'')",  "fontsize",3)

for i = 1:4, gcf().children(i).data_bounds([1 3]) = 0.5; end
 ]]></programlisting>
        <scilab:image>
            clf
            X = [1   1   1   1
                 2   3   4   5
                 3   4   5   6
                 4   5   6   7];
            y = [1 2 3 4];

            subplot(221), plot(X, y,  "o-"), title("plot(X, row)",  "fontsize",3)
                    // equivalent to plot(t, [1 1 1 1; 2 2 2 2; 3 3 3 3; 4 4 4 4])
            subplot(223), plot(X, y', "o-"), title("plot(X, col)  (row = col'')",  "fontsize",3)
            subplot(222), plot(X',y,  "o-"), title("plot(X'', row)",  "fontsize",3)
            subplot(224), plot(X',y', "o-"), title("plot(X'', col)  (row = col'')",  "fontsize",3)

            for i = 1:4, gcf().children(i).data_bounds([1 3]) = 0.5; end
        </scilab:image>
        <para/>
        <para/>
        <para>
            <emphasis role="bold">Post-tuning Axes and curves:</emphasis>
        </para>
        <programlisting role="example"><![CDATA[
x=[0:0.1:2*%pi]';
plot(x-4,sin(x), x+2,cos(x))

// axis centered at (0,0)
a=gca(); // Handle on axes entity
a.x_location = "origin";
a.y_location = "origin";

// Some operations on entities created by plot ...
isoview on
a.children // list the children of the axes : here it is an Compound child composed of 2 entities
poly1= a.children.children(2); //store polyline handle into poly1
poly1.foreground = 4;  // another way to change the style...
poly1.thickness = 3;   // ...and the thickness of a curve.
poly1.clip_state='off' // clipping control
isoview off
 ]]></programlisting>
        <scilab:image>
            x = [0:0.1:2*%pi]';
            plot(x-4,sin(x),x+2,cos(x))
            a = gca();
            a.x_location = "origin";
            a.y_location = "origin";
            isoview on
            a.children
            poly1 = a.children.children(2);
            poly1.foreground = 4;
            poly1.thickness = 3;
            poly1.clip_state='off'
            isoview off
        </scilab:image>
    </refsection>
    <refsection role="see also">
        <title>See also</title>
        <simplelist type="inline">
            <member>
                <link linkend="plot2d">plot2d</link>
            </member>
            <member>
                <link linkend="plot2d2">plot2d2</link>
            </member>
            <member>
                <link linkend="plot2d3">plot2d3</link>
            </member>
            <member>
                <link linkend="plot2d4">plot2d4</link>
            </member>
            <member>
                <link linkend="param3d">param3d</link>
            </member>
            <member>
                <link linkend="surf">surf</link>
            </member>
            <member>
                <link linkend="scf">scf</link>
            </member>
            <member>
                <link linkend="clf">clf</link>
            </member>
            <member>
                <link linkend="xdel">xdel</link>
            </member>
            <member>
                <link linkend="delete">delete</link>
            </member>
            <member>
                <link linkend="LineSpec">LineSpec</link>
            </member>
            <member>
                <link linkend="color_list">Named colors</link>
            </member>
            <member>
                <link linkend="GlobalProperty">GlobalProperty</link>
            </member>
        </simplelist>
    </refsection>
    <refsection role="history">
        <title>History</title>
        <revhistory>
            <revision>
                <revnumber>6.0.1</revnumber>
                <revdescription>
                    The "color"|"foreground", "markForeground", and "markBackground" GlobalProperty
                    colors can now be chosen among the full predefined colors list, or by
                    their "#RRGGBB" hexadecimal codes, or by their indices in the colormap.
                </revdescription>
            </revision>
            <revision>
                <revnumber>6.0.2</revnumber>
                <revdescription>
                    Plotting a function fun(x, params) with input parameters is now possible with
                    plot(x, list(fun, params)).
                </revdescription>
            </revision>
            <revision>
                <revnumber>6.1.0</revnumber>
                <revdescription>
                    logflag option added.
                </revdescription>
            </revision>
        </revhistory>
    </refsection>
</refentry>
