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<! Made by Html Translation Ver 1.0><html><head><title> 函数分布的快速绘图 </title></head><body BACKGROUND="../img1/bg0000.gif" tppabs="http://webclass.ncu.edu.tw/~junwu/img/bg0000.gif"><script language="JAVASCRIPT"><!--if (navigator.onLine){document.write("<!-- Spidersoft WebZIP Ad Banner Insert -->");document.write("<TABLE width=100% border=0 cellpadding=0 cellspacing=0>");document.write("<TR>");document.write("<TD>");document.write("<ILAYER id=ad1 visibility=hidden height=60></ILAYER>");document.write("<NOLAYER>");document.write("<IFRAME SRC='http://www.spidersoft.com/ads/bwz468_60.htm' width=100% height=60 marginwidth=0 marginheight=0 hspace=0 vspace=0 frameborder=0 scrolling=no></IFRAME>");document.write("</NOLAYER>");document.write("</TD>");document.write("</TR>");document.write("</TABLE>");document.write("<!-- End of Spidersoft WebZIP Ad Banner Insert-->");} //--></script><!-- Spidersoft WebZIP Ad Banner Insert --><!-- End of Spidersoft WebZIP Ad Banner Insert--><font COLOR="#0000FF"><h1>3.1.4 函数分布的快速绘图</h1></font><hr><p><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 COLOR="#FF0000" FACE="Times New Roman">fun</font>为一已定义的函数名称,例如 <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 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 y 1.2</i>之间画 出: </p><p><font COLOR="#FF0000" FACE="Times New Roman">>> fplot('sin(x)./x',[-20 20 -0.4 1.2])</font> </p><p><font COLOR="#FF0000" FACE="Times New Roman">>> title('Fplot of f(x)=sin(x)/x')</font> </p><p><font COLOR="#FF0000" FACE="Times New Roman">>> xlabel('x'), ylabel('f(x)')<br></font></p><hr><a HREF="ch3_1_3.htm" tppabs="http://webclass.ncu.edu.tw/~junwu/ch3_1_3.htm"><p><img SRC="../img1/lastpage.gif" tppabs="http://webclass.ncu.edu.tw/~junwu/img/lastpage.gif" BORDER="0" WIDTH="42" HEIGHT="42"></a> <a HREF="ch3_1_5.htm" tppabs="http://webclass.ncu.edu.tw/~junwu/ch3_1_5.htm"><img SRC="../img1/nextpage.gif" tppabs="http://webclass.ncu.edu.tw/~junwu/img/nextpage.gif" BORDER="0" HSPACE="10" WIDTH="42" HEIGHT="42"></a> <a HREF="../index.html" tppabs="http://webclass.ncu.edu.tw/~junwu/index.html"><img SRC="../img1/outline.gif" tppabs="http://webclass.ncu.edu.tw/~junwu/img/outline.gif" BORDER="0" HSPACE="6" WIDTH="42" HEIGHT="42"></a><br><font SIZE="2" COLOR="#AA55FF">上一页 下一页 讲义大纲 </font><layer src="http://www.spidersoft.com/ads/bwz468_60.htm" visibility="hidden" id="a1" width="600" onload="moveToAbsolute(ad1.pageX,ad1.pageY); a1.clip.height=60;visibility='show';"></layer> </p></body></html>
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