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<TITLE>  子图 </TITLE>
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<H1>3.1.2  子图</H1>
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要将数个相关的图画在同一页时，可以用<FONT COLOR=#FF0000 FACE="Times New Roman">subplot</FONT>这个指令。其语法为<FONT FACE="Times New Roman">
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">subplot(m,n,p)</FONT>，其中<FONT FACE="Times New Roman">
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">m</FONT><FONT FACE="Times New Roman">,</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">
n</FONT>代表绘图成<FONT FACE="Times New Roman"> <I>m</I> x <I>n</I>
</FONT>个子图，<FONT COLOR=#FF0000 FACE="Times New Roman">m</FONT>表示在<FONT FACE="Times New Roman">
y</FONT>方向有<FONT FACE="Times New Roman"> <I>m</I> </FONT>个图，<FONT FACE="Times New Roman">
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">n</FONT>表示在<FONT FACE="Times New Roman">
x </FONT>方向有<FONT FACE="Times New Roman"> </FONT><TT><I><FONT FACE="Courier New">n</FONT></I></TT><FONT FACE="Times New Roman">
</FONT>个图，<TT><FONT FACE="Courier New">p</FONT></TT><FONT FACE="Times New Roman">
</FONT>是代表第几个子图。下例是以<FONT FACE="Times New Roman">
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">subplot</FONT>分别画
出线性及对数尺度的四个子图：
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<FONT COLOR=#FF0000 FACE="Times New Roman">&gt;&gt; x=[0 2 5 7
10 12 15 17 20 21];</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">&gt;&gt; y=[0.1 0.2
0.5 0.6 0.9 1 1.2 1.26 1.22 1.2];</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">&gt;&gt; subplot(2,2,1),
plot(x,y)            % </FONT><FONT COLOR=#FF0000>画左上角的图</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">&gt;&gt; subplot(2,2,2),
semilogx(x,y)        % </FONT><FONT COLOR=#FF0000>画右上角的图</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">&gt;&gt; subplot(2,2,3),
semilogy(x,y)        % </FONT><FONT COLOR=#FF0000>画左下角的图</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">&gt;&gt; subplot(2,2,4),
loglog(x,y)          % </FONT><FONT COLOR=#FF0000>画右下角的图
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