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<TITLE> 三维的曲线绘图 </TITLE>
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<H1>3.2.1 三维的曲线绘图</H1>
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<FONT COLOR=#FF0000 FACE="Times New Roman">plot3</FONT><FONT FACE="Times New Roman">
</FONT>可以用来画一个三维的曲线，它的格式类似<FONT FACE="Times New Roman">
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">plot</FONT><FONT FACE="Times New Roman">
</FONT>，不过多了<FONT FACE="Times New Roman"> z</FONT>方向的数据。其与法可以是<FONT FACE="Times New Roman">
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">plot3(X,Y,Z)</FONT><FONT FACE="Times New Roman">
</FONT>或是<FONT FACE="Times New Roman"> </FONT><FONT COLOR=#FF0000 FACE="Times New Roman">plot3(X,Y,Z,'linetype')</FONT>，其中的<FONT FACE="Times New Roman">
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">linetype</FONT>是设定画线的符号和颜色。下面的例子说明一个三维的曲线图：
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<FONT COLOR=#FF0000 FACE="Times New Roman">>> t=0:pi/50:10*pi;</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">>> plot3(sin(t),cos(t),t)</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">>> title('Helix'),
xlabel('sin(t)', ylabel('cos(t)'), zlabel('t')</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">>> axis('ij')
% </FONT><FONT COLOR=#FF0000>加上这个指令，注意图的</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">y</FONT><FONT COLOR=#FF0000>轴及曲线方向改变了
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