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<title> 图形放大及缩小 </title>
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<h1>3.1.3 图形放大及缩小</h1>
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<p><font COLOR="#FF0000" FACE="Times New Roman">zoom</font><font FACE="Times New Roman"> </font>指令可以将图形放大或缩小，若要将图形放大时用
<font COLOR="#FF0000" FACE="Times New Roman">zoom on</font>，<font COLOR="#FF0000" FACE="Times New Roman">zoom out</font>，当不再须要放大或缩小图形时用 <font COLOR="#FF0000" FACE="Times New Roman">zoom off</font>。<tt> </tt></p>
<p><font COLOR="#FF0000" FACE="Times New Roman">>> M=peaks(25); % peaks </font><font COLOR="#FF0000">是</font><font COLOR="#FF0000" FACE="Times New Roman">MATLAB</font><font COLOR="#FF0000">内建的一个像山峰的特别函数，</font><font COLOR="#FF0000" FACE="Times New Roman">25</font><font COLOR="#FF0000">是这个</font> </p>
<p><font COLOR="#FF0000" FACE="Times New Roman">>> plot(M) % </font><font COLOR="#FF0000">函数矩阵的大小，如果数值愈大则画出的山峰图愈平滑</font>
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<p><font COLOR="#FF0000" FACE="Times New Roman">>> zoom on % </font><font COLOR="#FF0000">开始放大图形，每按一次</font><font COLOR="#FF0000" FACE="Times New Roman">Enter</font><font COLOR="#FF0000">键图形就放大一次</font> </p>
<p><font COLOR="#FF0000" FACE="Times New Roman">>> zoom out % </font><font COLOR="#FF0000">开始缩小图形，每按一次</font><font COLOR="#FF0000" FACE="Times New Roman">Enter</font><font COLOR="#FF0000">键图形就缩小一次</font> </p>
<p><font COLOR="#FF0000" FACE="Times New Roman">>> zoom off % </font><font COLOR="#FF0000">停止图形放大或缩小功能<br>
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