📄 9.htm
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<title>文件操作</title>
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<p class=MsoNormal align=center style='text-align:center'><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'>文件操作</span><span
lang=EN-US style='font-size:26.0pt;mso-bidi-font-size:12.0pt;color:blue'><o:p></o:p></span></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>
</span></div>
<p class=MsoNormal style='margin-left:21.0pt;text-indent:-21.0pt;mso-list:l3 level1 lfo1;
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"'>变量的保存与调用</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>我们可以使用</span><span lang=EN-US>save</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>来将</span><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"'>工作间的变量保存到文件中，以便以后可以调用这些变量。</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>一般格式：</span></p>
<p class=MsoNormal><span lang=EN-US>save filename variables</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>从文件中调用变量的格式：</span></p>
<p class=MsoNormal><span lang=EN-US>load filename variables</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>这里的文件的扩展名为</span><span lang=EN-US>.mat</span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>?a=1:1:100;<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>?t=2323;<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>?whos<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'><span
style="mso-spacerun: yes"> </span>Name<span style="mso-spacerun:
yes"> </span>Size<span style="mso-spacerun:
yes"> </span>Bytes<span
style="mso-spacerun: yes"> </span>Class<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'><span
style="mso-spacerun: yes"> </span>a<span style="mso-spacerun:
yes"> </span>1x100<span
style="mso-spacerun:
yes"> </span>800<span
style="mso-spacerun: yes"> </span>double array<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'><span
style="mso-spacerun: yes"> </span>t<span style="mso-spacerun:
yes"> </span>1x1<span
style="mso-spacerun:
yes">
</span>8<span style="mso-spacerun: yes"> </span>double array<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>Grand total is 101
elements using 808 bytes<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>?save ok a t<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>?a=1;<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>?t=2:0.1:3;<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>?whos<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'><span
style="mso-spacerun: yes"> </span>Name<span style="mso-spacerun:
yes"> </span>Size<span style="mso-spacerun:
yes"> </span>Bytes<span
style="mso-spacerun: yes"> </span>Class<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'><span
style="mso-spacerun: yes"> </span>a<span style="mso-spacerun:
yes"> </span>1x1<span
style="mso-spacerun:
yes">
</span>8<span style="mso-spacerun: yes"> </span>double array<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'><span
style="mso-spacerun: yes"> </span>t<span style="mso-spacerun:
yes"> </span>1x11<span
style="mso-spacerun:
yes">
</span>88<span style="mso-spacerun: yes"> </span>double array<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>Grand total is 12
elements using 96 bytes<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>?load ok a t<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>?whos<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'><span
style="mso-spacerun: yes"> </span>Name<span style="mso-spacerun:
yes"> </span>Size<span style="mso-spacerun:
yes"> </span>Bytes<span
style="mso-spacerun: yes"> </span>Class<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'><span
style="mso-spacerun: yes"> </span>a<span style="mso-spacerun:
yes"> </span>1x100<span
style="mso-spacerun:
yes"> </span>800<span
style="mso-spacerun: yes"> </span>double array<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'><span
style="mso-spacerun: yes"> </span>t<span style="mso-spacerun:
yes"> </span>1x1<span
style="mso-spacerun:
yes">
</span>8<span style="mso-spacerun: yes"> </span>double array<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>Grand total is 101
elements using 808 bytes<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>比较一下前后以及中修改后的差别</span></p>
<p class=MsoNormal style='margin-left:21.0pt;text-indent:-21.0pt;mso-list:l3 level1 lfo1;
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"'>文件的打开与关闭</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>使用</span><span lang=EN-US>fopen </span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>和</span><span lang=EN-US>fclose</span><span
style='font-family:宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:
"Times New Roman"'>可以对普通的文件打开，关闭及处理的功能。</span></p>
<p class=MsoNormal><span style='font-family:宋体;mso-ascii-font-family:"Times New Roman";
mso-hansi-font-family:"Times New Roman"'>格式：</span></p>
<p class=MsoNormal><span lang=EN-US>fp=fopen(fname,ftype)</span></p>
<p class=MsoNormal><span lang=EN-US>st=fclose(fp)</span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>?fp=fopen('ok.mat','r')<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>fp =<o:p></o:p></span></p>
<p class=MsoNormal style='text-indent:26.25pt'><span lang=EN-US
style='color:blue'>3<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>?st=fclose(fp)<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'>st =<o:p></o:p></span></p>
<p class=MsoNormal><span lang=EN-US style='color:blue'><span
style="mso-spacerun: yes"> </span>0<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:21.0pt;text-indent:-21.0pt;mso-list:l3 level1 lfo1;
tab-stops:list 21.0pt'> <span lang=EN-US style='font-size:
12.0pt;font-family:Wingdings;mso-font-kerning:0pt'>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"'>文件的输入与输出</span><span lang=EN-US><span
style="mso-spacerun: yes"> </span></span><span
lang=EN-US style='font-size:12.0pt;font-family:宋体;mso-font-kerning:0pt'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:42.0pt;text-indent:-21.0pt;mso-list:l3 level2 lfo1;
tab-stops:list 42.0pt'><span lang=EN-US style='font-size:
12.0pt;font-family:宋体;mso-font-kerning:0pt'>1.<span style='font:7.0pt "Times New Roman"'>
</span></span> <span style='font-size:12.0pt;font-family:宋体;
mso-font-kerning:0pt'>不定格式读取<span lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoNormal style='margin-left:21.0pt'><span lang=EN-US
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