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<TITLE>  横轴和纵轴的控制 </TITLE>
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<H1>3.1.1  横轴和纵轴的控制</H1>
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要控制绘图的横轴及纵轴比例，可以用<FONT FACE="Times New Roman">
</FONT><FONT COLOR=#FF0000 FACE="Times New Roman">axis</FONT>配合下列的相关的选项：
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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>设定横轴的下限及上限，以<FONT COLOR=#FF0000 FACE="Times New Roman"> ymin ymax</FONT><FONT FACE="Times New Roman"> </FONT>设定纵轴的下限及上限
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<TR><TD><FONT COLOR=#FF0000 FACE="Times New Roman">axis auto</FONT>
</TD><TD>横轴及纵轴依照数据大小的上下限来订定，横轴及纵轴比例是<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>横轴及纵轴比例是<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>将横轴纵轴的尺度比例设成相同值</TD></TR>
<TR><TD><FONT COLOR=#FF0000 FACE="Times New Roman">axis xy</FONT>
</TD><TD>预设值使用卡氏座标即是将图原点设在左下角横轴由左往右增纵轴由下往上递增
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<TR><TD><FONT COLOR=#FF0000 FACE="Times New Roman">axis ij</FONT>
</TD><TD>使用矩阵格式即是将图原点设在左上角横轴不变纵轴由上往下递增
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<TR><TD><FONT COLOR=#FF0000 FACE="Times New Roman">axis normal</FONT>
</TD><TD>以预设值画纵轴及横轴</TD></TR>
<TR><TD><FONT COLOR=#FF0000 FACE="Times New Roman">axis off</FONT>
</TD><TD>将纵轴及横轴取消</TD></TR>
<TR><TD><FONT COLOR=#FF0000 FACE="Times New Roman">axis on</FONT>
</TD><TD>恢复纵轴及横轴</TD></TR>
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上述的各个指令的语法也可以将关键字放在括弧内的单引号之间，如<FONT COLOR=#FF0000 FACE="Times New Roman">axis('
 ')</FONT>。<BR>
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以下是应用<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">&gt;&gt; x=linspace(0,2*pi,30);
y=sin(x); z=cos(x);</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">&gt;&gt; plot(x,y,x,z)
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<FONT COLOR=#FF0000 FACE="Times New Roman">&gt;&gt; axis off</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">&gt;&gt; axis on</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">&gt;&gt; axis('square','equal')</FONT>
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<FONT COLOR=#FF0000 FACE="Times New Roman">&gt;&gt; axis('xy','normal')
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