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<title> 三維的曲線繪圖 </title>
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<h1><font COLOR="#0000FF">3.2.1 三維的曲線繪圖</font></h1>
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<p><font COLOR="#FF0000" FACE="Times New Roman">plot3</font><font FACE="Times New Roman"> </font>可以用來畫一個(gè)三維的曲線，它的格式類似
<font COLOR="#FF0000" FACE="Times New Roman">plot</font><font FACE="Times New Roman"> </font>，不過多了
<font FACE="Times New Roman">z</font>方向的數(shù)據(jù)。其與法可以是 <font COLOR="#FF0000" FACE="Times New Roman">plot3(X,Y,Z)</font><font FACE="Times New Roman"> </font>或是
<font COLOR="#FF0000" FACE="Times New Roman">plot3(X,Y,Z,'linetype')</font>，其中的 <font COLOR="#FF0000" FACE="Times New Roman">linetype</font>是設(shè)定畫線的符號(hào)和顏色。下面的例子說明一個(gè)三維的曲線圖：
</p>
<p><font COLOR="#FF0000" FACE="Times New Roman">>> t=0:pi/50:10*pi;</font> </p>
<p><font COLOR="#FF0000" FACE="Times New Roman">>> plot3(sin(t),cos(t),t)</font> </p>
<p><font COLOR="#FF0000" FACE="Times New Roman">>> title('Helix'), xlabel('sin(t)',
ylabel('cos(t)'), zlabel('t')</font> </p>
<p><font COLOR="#FF0000" FACE="Times New Roman">>> axis('ij') % </font><font COLOR="#FF0000">加上這個(gè)指令，注意圖的</font><font COLOR="#FF0000" FACE="Times New Roman">y</font><font COLOR="#FF0000">軸及曲線方向改變了 <br>
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