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<TITLE> 橫軸和縱軸的控制 </TITLE>
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<H1>3.1.1 橫軸和縱軸的控制</H1>
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要控制繪圖的橫軸及縱軸比例，可以用<FONT FACE="Times New Roman">
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">axis</FONT>配合下列的相關的選項：
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<TR><TD><FONT COLOR=#FF0000 FACE="Times New Roman">axis([xmin xmax ymin ymax])</FONT>
</TD><TD>以<FONT COLOR=#FF0000 FACE="Times New Roman"> xmin xmax</FONT><FONT FACE="Times New Roman"> </FONT>設定橫軸的下限及上限，以<FONT COLOR=#FF0000 FACE="Times New Roman"> ymin ymax</FONT><FONT FACE="Times New Roman"> </FONT>設定縱軸的下限及上限
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<TR><TD><FONT COLOR=#FF0000 FACE="Times New Roman">axis auto</FONT>
</TD><TD>橫軸及縱軸依照數據大小的上下限來訂定，橫軸及縱軸比例是<FONT FACE="Times New Roman">4:3</FONT>
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<TR><TD><FONT COLOR=#FF0000 FACE="Times New Roman">axis square</FONT>
</TD><TD>橫軸及縱軸比例是<FONT FACE="Times New Roman"> 1:1</FONT>
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<TR><TD><FONT COLOR=#FF0000 FACE="Times New Roman">axis equal</FONT>
</TD><TD>將橫軸縱軸的尺度比例設成相同值</TD></TR>
<TR><TD><FONT COLOR=#FF0000 FACE="Times New Roman">axis xy</FONT>
</TD><TD>預設值使用卡氏座標即是將圖原點設在左下角橫軸由左往右增縱軸由下往上遞增
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<TR><TD><FONT COLOR=#FF0000 FACE="Times New Roman">axis ij</FONT>
</TD><TD>使用矩陣格式即是將圖原點設在左上角橫軸不變縱軸由上往下遞增
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<TR><TD><FONT COLOR=#FF0000 FACE="Times New Roman">axis normal</FONT>
</TD><TD>以預設值畫縱軸及橫軸</TD></TR>
<TR><TD><FONT COLOR=#FF0000 FACE="Times New Roman">axis off</FONT>
</TD><TD>將縱軸及橫軸取消</TD></TR>
<TR><TD><FONT COLOR=#FF0000 FACE="Times New Roman">axis on</FONT>
</TD><TD>恢復縱軸及橫軸</TD></TR>
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上述的各個指令的語法也可以將關鍵字放在括弧內的單引號之間，如<FONT COLOR=#FF0000 FACE="Times New Roman">axis('
')</FONT>。<BR>
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以下是應用<FONT FACE="Times New Roman"> </FONT><FONT COLOR=#FF0000 FACE="Times New Roman">axis</FONT>的范例：
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<FONT COLOR=#FF0000 FACE="Times New Roman">>> x=linspace(0,2*pi,30);
y=sin(x); z=cos(x);</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">>> plot(x,y,x,z)
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<FONT COLOR=#FF0000 FACE="Times New Roman">>> axis off</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">>> axis on</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">>> axis('square','equal')</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">>> axis('xy','normal')
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