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<title>字符串的基本操作</title>
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<div class=Section1 style='layout-grid:15.6pt'>
<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'>字符串的基本操作</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>
</span></div>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'>在<span
lang=EN-US>matlab工作空间中，字符串是以向量形式来存储的，我们把用<span style='color:red'>’’</span><span
style='color:black'>所包含的内容来表示该字符串。<o:p></o:p></span></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'>?s='student'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'>s =<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'>student<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
style='color:black'>字符串也可以作为矩阵来连接。<span lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'>?s1='who'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'>s1 =<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'>who<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'>?s=[s,s1]<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'>s =<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'>studentwho</span><span lang=EN-US
style='color:black'><o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
style='color:black'>求字符串的长度<span lang=EN-US><o:p></o:p></span></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'>?length(s)<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'>ans =<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph;
text-indent:24.0pt'><span lang=EN-US style='color:blue'>10<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph;
text-indent:-7.5pt'><span lang=EN-US style='color:blue'><span
style="mso-spacerun: yes"> </span>?size(s)<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'>ans =<o:p></o:p></span></p>
<p class=MsoBodyText style='margin-left:52.5pt;text-align:justify;text-justify:
inter-ideograph;text-indent:-30.0pt;mso-list:l0 level1 lfo2;tab-stops:list 52.5pt'>
<span
lang=EN-US style='color:blue'>1 <span style='font:7.0pt "Times New Roman"'>
</span></span><span lang=EN-US style='color:blue'>10<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
style='color:black'>长字符串的表示</span><span lang=EN-US style='color:blue'><o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'>? about={...<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'<span
style="mso-spacerun: yes"> </span>模拟频率调制'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'角调制与线性调制不同，角调制中已'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'调信号的频谱与调制信号的频谱之间'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'不存在线性对应关系，'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'而是产生出与频谱搬移不同的分量，'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'因而呈现出非线性过程的特性，故又'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'称非线性调制。'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'调频就是用消息信号f(t)来调制载波'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'的频率部分，依靠载波信号频率的变'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'化反映消息信号，用公式则为：'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'<span style="mso-spacerun:
yes"> </span>SFM(t)=Acos[wCt+KFM∫f(t)dt]'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'调频信号f(t) 的解调可用相干解调'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'和非相干解调，相干解调适用于NBF'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'M，非相干解调适用于任一种调频信'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'号，具体使用可见相关类型。'}<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'>about = <o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'<span style="mso-spacerun:
yes"> </span>模拟频率调制'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'角调制与线性调制不同，角调制中已'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'调信号的频谱与调制信号的频谱之间'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'不存在线性对应关系，'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'而是产生出与频谱搬移不同的分量，'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'因而呈现出非线性过程的特性，故又'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'称非线性调制。'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'调频就是用消息信号f(t)来调制载波'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'的频率部分，依靠载波信号频率的变'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'化反映消息信号，用公式则为：'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'<span style="mso-spacerun: yes">
</span>SFM(t)=Acos[wCt+KFM∫f(t)dt]'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'调频信号f(t) 的解调可用相干解调'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'和非相干解调，相干解调适用于NBF'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph'><span
lang=EN-US style='color:blue'><span style="mso-spacerun:
yes"> </span>'M，非相干解调适用于任一种调频信'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph;
text-indent:24.0pt'><span lang=EN-US style='color:blue'>'号，具体使用可见相关类型。'<o:p></o:p></span></p>
<p class=MsoBodyText style='text-align:justify;text-justify:inter-ideograph;
text-indent:9.0pt'>字符串内的单引号是由两个连续的单引号来表示。<span lang=EN-US style='color:blue'><o:p></o:p></span></p>
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