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<title>变量及其命名规则</title>
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<p class=MsoNormal align=center style='text-align:center'><b><span
style='font-size:26.0pt;mso-bidi-font-size:12.0pt;font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman";color:blue'>变量及其命名规则</span></b><b><span
lang=EN-US style='font-size:26.0pt;mso-bidi-font-size:12.0pt;color:blue'><o:p></o:p></span></b></p>
<div class=MsoNormal align=center style='text-align:center'><span lang=EN-US
style='font-size:12.0pt;font-family:宋体;mso-font-kerning:0pt'>
<hr size=2 width="100%" align=center>
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<p class=MsoNormal style='margin-left:0cm;text-indent:0cm;mso-list:l0 level1 lfo2;
tab-stops:list 21.0pt'> <span lang=EN-US style='font-family:
Wingdings'>l<span style='font:7.0pt "Times New Roman"'>
</span></span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>变量</span></p>
<p class=MsoNormal style='margin-left:42.0pt;text-indent:-21.0pt;mso-list:l1 level2 lfo4;
tab-stops:list 42.0pt'> <span lang=EN-US>1.<span
style='font:7.0pt "Times New Roman"'>
</span></span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>变量名的大小写是敏感。</span></p> <p class=MsoNormal style='margin-left:42.0pt;text-indent:-21.0pt;mso-list:l1 level2 lfo4;
tab-stops:list 42.0pt'> <span lang=EN-US>2.<span
style='font:7.0pt "Times New Roman"'>
</span></span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>变量的第一个字符必须为英文字母，而且不能超过</span><span
lang=EN-US>31</span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>个字符。</span></p> <p class=MsoNormal style='margin-left:42.0pt;text-indent:-21.0pt;mso-list:l1 level2 lfo4;
tab-stops:list 42.0pt'> <span lang=EN-US>3.<span
style='font:7.0pt "Times New Roman"'>
</span></span><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>变量名可以包含下连字符、数字，但不能为空格符、标点。</span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>预定义的变量</span></p>
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<p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
style='color:red'>ans</span></p>
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border-left:none;mso-border-left-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>预设的计算结果的变量名</span></p>
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border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
style='color:red'>eps</span></p>
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none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span lang=EN-US>MATLAB</span><span style='font-family:
宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>定义的正的极小值</span><tt><span
lang=EN-US style='font-size:10.0pt;font-family:"Courier New"'>=</span></tt><span
lang=EN-US>2.2204e-16</span></p>
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border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
style='color:red'>pi</span></p>
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<td width=264 valign=top style='width:198.0pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>内建的</span><span lang=EN-US>π</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>值</span></p>
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<td width=127 valign=top style='width:95.6pt;border:solid windowtext .5pt;
border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
style='color:red'>inf</span></p>
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<td width=264 valign=top style='width:198.0pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span lang=EN-US>∞</span><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>值，无限大</span><span
lang=EN-US> ( <img width=16 height=46
src="./3_1/image001.gif" v:shapes="_x0000_i1026"> )</span></p>
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<td width=127 valign=top style='width:95.6pt;border:solid windowtext .5pt;
border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
style='color:red'>NaN</span></p>
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<td width=264 valign=top style='width:198.0pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>无法定义一个数目</span><span lang=EN-US> (
<img width=16 height=46
src="./3_1/image002.gif" v:shapes="_x0000_i1027"> )</span></p>
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<td width=127 valign=top style='width:95.6pt;border:solid windowtext .5pt;
border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
style='color:red'>i </span><span style='font-family:宋体;mso-ascii-font-family:
"Times New Roman";mso-hansi-font-family:"Times New Roman";color:red'>或</span><span
lang=EN-US style='color:red'> j<o:p></o:p></span></p>
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<td width=264 valign=top style='width:198.0pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>虚数单位</span><span lang=EN-US>i=j=</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>√</span><span lang=EN-US>-1</span></p>
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border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
style='color:red'>nargin<o:p></o:p></span></p>
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<td width=264 valign=top style='width:198.0pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>函数输入参数个数</span></p>
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<td width=127 valign=top style='width:95.6pt;border:solid windowtext .5pt;
border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
style='color:red'>nargout<o:p></o:p></span></p>
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<td width=264 valign=top style='width:198.0pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt'>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>函数输出参数个数</span></p>
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<td width=127 valign=top style='width:95.6pt;border:solid windowtext .5pt;
border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt;
height:7.5pt'>
<p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
style='color:red'>realmax<o:p></o:p></span></p>
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<td width=264 valign=top style='width:198.0pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt;height:7.5pt'>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>最大的正实数</span></p>
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<td width=127 valign=top style='width:95.6pt;border:solid windowtext .5pt;
border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt;
height:7.5pt'>
<p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
style='color:red'>realmin<o:p></o:p></span></p>
</td>
<td width=264 valign=top style='width:198.0pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt;height:7.5pt'>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>最小的正实数</span></p>
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<tr style='height:7.5pt'>
<td width=127 valign=top style='width:95.6pt;border:solid windowtext .5pt;
border-top:none;mso-border-top-alt:solid windowtext .5pt;padding:0cm 5.4pt 0cm 5.4pt;
height:7.5pt'>
<p class=MsoNormal align=center style='text-align:center'><span lang=EN-US
style='color:red'>flops<o:p></o:p></span></p>
</td>
<td width=264 valign=top style='width:198.0pt;border-top:none;border-left:
none;border-bottom:solid windowtext .5pt;border-right:solid windowtext .5pt;
mso-border-top-alt:solid windowtext .5pt;mso-border-left-alt:solid windowtext .5pt;
padding:0cm 5.4pt 0cm 5.4pt;height:7.5pt'>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>浮点运算次数</span></p>
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<p class=MsoNormal style='margin-left:21.0pt'><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>而键入</span><span
lang=EN-US style='color:red'>clear</span><span style='font-family:宋体;
mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"'>则是去除所有定义过的变量名称。</span></p>
<div class=MsoNormal align=center style='margin-left:21.0pt;text-align:center'><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-font-kerning:0pt'>
<hr size=2 width="100%" align=center>
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