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<TITLE>  函数分布的快速绘图 </TITLE>
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<H1>3.1.4  函数分布的快速绘图</H1>
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<FONT COLOR=#FF0000 FACE="Times New Roman">fplot</FONT>的指令可以用来自动的画一个已定义的函数分布图，而无须产生绘图所须要的一组数据做为变数。其语法
为<FONT COLOR=#FF0000 FACE="Times New Roman">fplot('fun',[xmin xmax ymin ymax])</FONT>，其中<FONT FACE="Times New Roman"> </FONT><FONT COLOR=#FF0000 FACE="Times New Roman">fun</FONT>为一已定义的函数名称，例如<FONT FACE="Times New Roman">
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">sin</FONT><FONT FACE="Times New Roman">,
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">cos</FONT>等等；而<FONT FACE="Times New Roman">
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">xmin</FONT><FONT FACE="Times New Roman">,
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">xmax</FONT><FONT FACE="Times New Roman">,
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">ymin</FONT><FONT FACE="Times New Roman">,
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">ymax</FONT>
则是设定绘图横轴及纵轴的下限及上限。以下的例子是将一函数<I> f(x)=sin(x)/x</I>在<I>-20　x　20</I>,-<I>0.4</I><I>　y　1.2</I>之间画
出：
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<FONT COLOR=#FF0000 FACE="Times New Roman">&gt;&gt; fplot('sin(x)./x',[-20 20 -0.4 1.2])</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">&gt;&gt; title('Fplot of f(x)=sin(x)/x')</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">&gt;&gt; xlabel('x'), ylabel('f(x)')<BR></FONT><HR>
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