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style="mso-spacerun: yes"> </SPAN>Hm_full<SPAN
style="mso-spacerun: yes"> </SPAN>=<SPAN style="mso-spacerun: yes">
</SPAN>uimenu(Hm_control</SPAN>，<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"> ' Label ' </SPAN>，<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"> ' Full Menus ' </SPAN>，<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">... <BR><SPAN
style="mso-tab-count: 3">
</SPAN><SPAN style="mso-spacerun: yes"> </SPAN>' CallBack ' </SPAN>，<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"> ' set(Hm_extra</SPAN>，<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"> '<SPAN
style="mso-spacerun: yes"> </SPAN>' Visible '<SPAN
style="mso-spacerun: yes"> </SPAN>' </SPAN>，<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"> '<SPAN style="mso-spacerun: yes">
</SPAN>' on '<SPAN style="mso-spacerun: yes"> </SPAN>' ) ' )</SPAN>；<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom">当选择了<B
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">Limited Menus</SPAN></B>项时，<B
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">Extra</SPAN></B>菜单就从菜单条中消失。当选择了<B
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">Full Menus</SPAN></B>项时，<B
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">Extra</SPAN></B>菜单又重新显示在原来的位置的菜单条上。<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom"><SPAN
style="FONT-FAMILY: 黑体">回调属性<SPAN lang=EN-US><o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom"><B
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></B></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom; TEXT-INDENT: 21.3pt"><B
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-spacerun: yes"> </SPAN>' Callback ' </SPAN></B>属性值是一个<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'">MATLAB</SPAN>字符串，<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'">MATLAB</SPAN>将它传给函数<B
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">eval</SPAN></B>并在<B
style="mso-bidi-font-weight: normal"><SPAN
style="FONT-FAMILY: 楷体">命令</SPAN>窗口工作空间</B>执<SPAN
lang=EN-US><BR>行。它对于函数</SPAN><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">M</SPAN>文件有重要的隐含意义，我们将在本章后面继续讨论这一属性。<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom; TEXT-INDENT: 21.3pt">因为<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"> ' <B
style="mso-bidi-font-weight: normal">Callback '
</B></SPAN>属性必须是字符串，所以在字符号内多重<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">MATLAB</SPAN>命令、后续行以及字符串都会使必需的句法变得十分复杂。如果有不止一个命令要执行，命令间必须适当地分隔开来。例如，<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">>>uimenu( ' Label ' </SPAN>，<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"> ' Test ' </SPAN>，<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"> ' CallBack ' </SPAN>，<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"> ' grid on</SPAN>；<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"> set(gca</SPAN>，<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"> '<SPAN
style="mso-spacerun: yes"> </SPAN>' Box '<SPAN
style="mso-spacerun: yes"> </SPAN>' </SPAN>，<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"> '<SPAN style="mso-spacerun: yes">
</SPAN>' on '<SPAN style="mso-spacerun: yes"> </SPAN>' ) ' )</SPAN>；<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom">把一个字符串传给<B
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">eval</SPAN>，</B>使命令<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-tab-count: 3">
</SPAN>>> grid on</SPAN>；<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"> set(gca</SPAN>，<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"> ' Box ' </SPAN>，<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"> ' on ' )<o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom">在<SPAN
style="FONT-FAMILY: 楷体">命令</SPAN>窗口工作空间中执行。这是合法的句法，因为命令用逗号或分号隔开，多重命令可输入到同一命令行中。在定义回调函数时，也遵循<SPAN
lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">MATLAB</SPAN>规定，即在已引用的字符串内，用两个单引号来表示单引号。<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal
style="VERTICAL-ALIGN: bottom; TEXT-INDENT: 21.3pt">字符串可以串接起来生成一个合法<SPAN
lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">MATLAB</SPAN>字符串，只要把它们括在方括号中。<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-tab-count: 1">
</SPAN><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-tab-count: 1">
</SPAN>>>uimenu( ' Label ' </SPAN>，<SPAN
style="FONT-FAMILY: 'Times New Roman'"> <SPAN lang=EN-US>' Test '
</SPAN></SPAN>，<SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"> '
CallBack ' </SPAN>，<SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'">[ '
grid on</SPAN>，<SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"> '
</SPAN>，<SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"> '<SPAN
style="mso-spacerun: yes"> </SPAN>set(gca</SPAN>，<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"> '<SPAN style="mso-spacerun: yes">
</SPAN>' Box '<SPAN style="mso-spacerun: yes"> </SPAN>' </SPAN>，<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"> '<SPAN
style="mso-spacerun: yes"> </SPAN>' on<SPAN
style="mso-spacerun: yes"> </SPAN>'<SPAN style="mso-spacerun: yes">
</SPAN>'<SPAN style="mso-spacerun: yes"> </SPAN>) ' ])</SPAN>；<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom">注意字符串<SPAN
style="FONT-FAMILY: 'Times New Roman'"> <B
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US>'</SPAN></B><SPAN
lang=EN-US> <B style="mso-bidi-font-weight: normal">grid on '
</B></SPAN></SPAN>含有所需的逗号以分隔两个命令。<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal
style="VERTICAL-ALIGN: bottom; TEXT-INDENT: 21.3pt">如果使用了续行号，上述命令可写为<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom; TEXT-INDENT: 21.3pt"><SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom; TEXT-INDENT: 42.55pt"><SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'">>>uimenu( ' Label '
</SPAN>，<SPAN lang=EN-US style="FONT-FAMILY: 'Times New Roman'"> ' Test '
</SPAN>，<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">...<o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom; TEXT-INDENT: 42.55pt"><SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-tab-count: 2">
</SPAN><SPAN style="mso-spacerun: yes"> </SPAN>' CallBack ' </SPAN>，<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'">[...<o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom; TEXT-INDENT: 42.55pt"><SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-tab-count: 2">
</SPAN><SPAN style="mso-spacerun: yes"> </SPAN>' grid on</SPAN>，<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"> ' </SPAN>，<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">...<o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom; TEXT-INDENT: 42.55pt"><SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-tab-count: 2">
</SPAN><SPAN style="mso-spacerun: yes"> </SPAN>'<SPAN
style="mso-spacerun: yes"> </SPAN>set(gca</SPAN>，<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"> '<SPAN style="mso-spacerun: yes">
</SPAN>' Box '<SPAN style="mso-spacerun: yes"> </SPAN>' </SPAN>，<SPAN
style="FONT-FAMILY: 'Times New Roman'"> <SPAN lang=EN-US>'<SPAN
style="mso-spacerun: yes"> </SPAN>' on '<SPAN
style="mso-spacerun: yes"> </SPAN>' ) ' ...<o:p></o:p></SPAN></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom; TEXT-INDENT: 42.55pt"><SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><SPAN
style="mso-tab-count: 2">
</SPAN>])</SPAN>；<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal
style="VERTICAL-ALIGN: bottom">上例中命令行被分隔，每行的末尾加上了三个句号表示命令的继续。注意到上列单行的所有元素都被保留，包括字符串分隔命令的逗号。在<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"> ' grid on</SPAN>，<SPAN
style="FONT-FAMILY: 'Times New Roman'"> </SPAN>…<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">'
</SPAN>行中最后引号后的逗号是可选的；下一行开始的空格起相同的作用。欲了解详情，请参阅前面关于建立行向量的章节。<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal
style="VERTICAL-ALIGN: bottom; TEXT-INDENT: 21.3pt">如果引号、逗号和括号不正确输入，<SPAN
lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">MATLAB</SPAN>将给出警告；但在复杂回调字符串中很难寻找错误<SPAN
lang=EN-US><BR>的。为了使错误最少，对包含</SPAN><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">MATLAB</SPAN>语句的回调字符串请记住以下的一些规则：<SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal style="VERTICAL-ALIGN: bottom"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 42.6pt; VERTICAL-ALIGN: bottom; TEXT-INDENT: -21.3pt"><SPAN
lang=EN-US><SPAN style="mso-tab-count: 1">
</SPAN>把整个回调字符串括在方括号中，不要忘记最后的右括号</SPAN><B
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">'</SPAN></B><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"> </SPAN>）<B
style="mso-bidi-font-weight: normal"><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'">'</SPAN></B><SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"> </SPAN>。<SPAN lang=EN-US
style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN-LEFT: 42.6pt; VERTICAL-ALIGN: bottom; TEXT-INDENT: -21.3pt"><SPAN
lang=EN-US><SPAN style="mso-tab-count: 1"> </SPAN>把各语句括上单引号。</SPAN><SPAN
lang=EN-US style="FONT-FAMILY: 'Times New Roman'"><o:p></o:p></SPAN></P>
<P class=MsoNormal
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