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<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
* Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
* Copyright (C) ENPC - Jean-Philippe Chancelier
*
* This file must be used under the terms of the CeCILL.
* This source file is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at
* http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
*
-->
<refentry version="5.0-subset Scilab" xml:id="Sfgrayplot" xml:lang="en"
xmlns="http://docbook.org/ns/docbook"
xmlns:xlink="http://www.w3.org/1999/xlink"
xmlns:svg="http://www.w3.org/2000/svg"
xmlns:ns3="http://www.w3.org/1999/xhtml"
xmlns:mml="http://www.w3.org/1998/Math/MathML"
xmlns:db="http://docbook.org/ns/docbook">
<info>
<pubdate>$LastChangedDate$</pubdate>
</info>
<refnamediv>
<refname>Sfgrayplot</refname>
<refpurpose>esboo 2d suave de uma superfcie definida por uma funo
utilizando cores </refpurpose>
</refnamediv>
<refsynopsisdiv>
<title>Seqncia de Chamamento</title>
<synopsis>Sfgrayplot(x,y,f,<opt_args>)
Sfgrayplot(x,y,f [,strf, rect, nax, zminmax, colminmax, mesh, colout])</synopsis>
</refsynopsisdiv>
<refsection>
<title>Parmetros</title>
<variablelist>
<varlistentry>
<term>x,y</term>
<listitem>
<para>vetores linhas de reais de tamanhos n1 e n2. </para>
</listitem>
</varlistentry>
<varlistentry>
<term>f</term>
<listitem>
<para>funo do Scilab (z=f(x,y)) </para>
</listitem>
</varlistentry>
<varlistentry>
<term><opt_args></term>
<listitem>
<para>representa uma seqncia de declaraes <literal>key1=value1,
key2=value2</literal>,... onde <literal>key1</literal>,
<literal>key2,...</literal> podem ser um dos seguintes: strf, rect,
nax, zminmax, colminmax, mesh, colout (ver <link
linkend="plot2d">plot2d</link> para os trs primeiros e <link
linkend="fec">fec</link> para os quatro ltimos).</para>
</listitem>
</varlistentry>
<varlistentry>
<term>strf,rect,nax</term>
<listitem>
<para>ver <link linkend="plot2d">plot2d</link>.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>zminmax, colminmax, mesh, colout</term>
<listitem>
<para>ver <link linkend="fec">fec</link>.</para>
</listitem>
</varlistentry>
</variablelist>
</refsection>
<refsection>
<title>Descrio</title>
<para><literal>Sfgrayplot</literal> o mesmo que
<literal>fgrayplot</literal> mas o esboo suavizado. A funo
<literal>fec</literal> utilizada para suavizao. A superfcie
esboada assumindo-se que linear em um conjunto de tringulos
construdos a partir do grid (aqui, com n1=5, n2=3):</para>
<programlisting role = ""><![CDATA[
_____________
| /| /| /| /|
|/_|/_|/_|/_|
| /| /| /| /|
|/_|/_|/_|/_|
]]></programlisting>
<para>A funo <link linkend="colorbar">colorbar</link> pode ser utilizada
para se visualizar a escala de cores (mas voc deve saber (ou computar) os
valores mnimo e mximo).</para>
<para>Ao invs de Sfgrayplot, voc pode usar <link
linkend="Sgrayplot">Sgrayplot</link> este pode ser um pouco mais
rpido.</para>
<para>Entre com o comando <literal>Sfgrayplot()</literal> para visualizar
uma demonstrao.</para>
</refsection>
<refsection>
<title>Exemplos</title>
<programlisting role="example"><![CDATA[
// exemplo #1: esboo de 4 superfcies
function z=surf1(x,y), z=x*y, endfunction
function z=surf2(x,y), z=x^2-y^2, endfunction
function z=surf3(x,y), z=x^3+y^2, endfunction
function z=surf4(x,y), z=x^2+y^2, endfunction
xbasc()
xset("colormap",[jetcolormap(64);hotcolormap(64)])
x = linspace(-1,1,60);
y = linspace(-1,1,60);
drawlater() ;
subplot(2,2,1)
colorbar(-1,1,[1,64])
Sfgrayplot(x,y,surf1,strf="041",colminmax=[1,64])
xtitle("f(x,y) = x*y")
subplot(2,2,2)
colorbar(-1,1,[65,128])
Sfgrayplot(x,y,surf2,strf="041",colminmax=[65,128])
xtitle("f(x,y) = x^2-y^2")
subplot(2,2,3)
colorbar(-1,2,[65,128])
Sfgrayplot(x,y,surf3,strf="041",colminmax=[65,128])
xtitle("f(x,y) = x^3+y^2")
subplot(2,2,4)
colorbar(0,2,[1,64])
Sfgrayplot(x,y,surf4,strf="041",colminmax=[1,64])
xtitle("f(x,y) = x^2+y^2")
drawnow() ;
xselect()
// exemplo #2: esboo de surf3 e adio de algumas linhas de contorno
function z=surf3(x,y), z=x^3+y^2, endfunction
xbasc()
x = linspace(-1,1,60);
y = linspace(-1,1,60);
xset("colormap",hotcolormap(128))
drawlater() ;
colorbar(-1,2)
Sfgrayplot(x,y,surf3,strf="041")
fcontour2d(x,y,surf3,[-0.1, 0.025, 0.4],style=[1 1 1],strf="000")
xtitle("f(x,y) = x^3+y^2")
drawnow() ;
xselect()
// exemplo #3: esboo de surf3 e uso dos argumentos opcionais zminmax e colout
// para restringir o esboo em -0.5<= z <= 1
function z=surf3(x,y), z=x^3+y^2, endfunction
xbasc()
x = linspace(-1,1,60);
y = linspace(-1,1,60);
xset("colormap",jetcolormap(128))
drawlater() ;
zminmax = [-0.5 1]; colors=[32 96];
colorbar(zminmax(1),zminmax(2),colors)
Sfgrayplot(x, y, surf3, strf="041", zminmax=zminmax, colout=[0 0], colminmax=colors)
fcontour2d(x,y,surf3,[-0.5, 1],style=[1 1 1],strf="000")
xtitle("f(x,y) = x^3+y^2, com partes abaixo de z = -0.5 e acima de z = 1 removidas")
drawnow() ;
xselect()
]]></programlisting>
</refsection>
<refsection>
<title>Ver Tambm</title>
<simplelist type="inline">
<member><link linkend="fec">fec</link></member>
<member><link linkend="fgrayplot">fgrayplot</link></member>
<member><link linkend="grayplot">grayplot</link></member>
<member><link linkend="Sgrayplot">Sgrayplot</link></member>
</simplelist>
</refsection>
<refsection>
<title>Autor</title>
<para>J.Ph.C.</para>
</refsection>
</refentry>
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