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<title> 子圖 </title>
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<h1>3.1.2 子圖</h1>
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<p>要將數個相關的圖畫在同一頁時，可以用<font COLOR="#FF0000" FACE="Times New Roman">subplot</font>這個指令。其語法為 <font COLOR="#FF0000" FACE="Times New Roman">subplot(m,n,p)</font>，其中 <font COLOR="#FF0000" FACE="Times New Roman">m</font><font FACE="Times New Roman">,</font><font COLOR="#FF0000" FACE="Times New Roman"> n</font>代表繪圖成 <font FACE="Times New Roman"><i>m</i> x <i>n</i>
</font>個子圖，<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>個圖，
<font COLOR="#FF0000" FACE="Times New Roman">n</font>表示在 <font FACE="Times New Roman">x </font>方向有 <tt><i><font FACE="Courier New">n</font></i></tt><font FACE="Times New Roman"> </font>個圖，<tt><font FACE="Courier New">p</font></tt><font FACE="Times New Roman"> </font>是代表第幾個子圖。下例是以 <font COLOR="#FF0000" FACE="Times New Roman">subplot</font>分別畫
出線性及對數尺度的四個子圖： </p>
<p><font COLOR="#FF0000" FACE="Times New Roman">>> x=[0 2 5 7 10 12 15 17 20 21];</font>
</p>
<p><font COLOR="#FF0000" FACE="Times New Roman">>> y=[0.1 0.2 0.5 0.6 0.9 1 1.2 1.26
1.22 1.2];</font> </p>
<p><font COLOR="#FF0000" FACE="Times New Roman">>> subplot(2,2,1), plot(x,y) % </font><font COLOR="#FF0000">畫左上角的圖</font> </p>
<p><font COLOR="#FF0000" FACE="Times New Roman">>> subplot(2,2,2), semilogx(x,y) % </font><font COLOR="#FF0000">畫右上角的圖</font> </p>
<p><font COLOR="#FF0000" FACE="Times New Roman">>> subplot(2,2,3), semilogy(x,y) % </font><font COLOR="#FF0000">畫左下角的圖</font> </p>
<p><font COLOR="#FF0000" FACE="Times New Roman">>> subplot(2,2,4), loglog(x,y) % </font><font COLOR="#FF0000">畫右下角的圖 <br>
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