[MATLAB图像处理] 请高手看一下这个程序，谢谢！

[huo951]

x=0：pi/100:2*pi;
y=2*exp(-0.5*x).*sin(2*pi*x);
hl=plot(x,y);
hc=uicontextmenu;
hls=uimenu(hc,'Label','线型');
hlw=uimenu(hc,'Label','线宽');
uimenu(hls,'Label','虚线','Call','set(hl,"LineStyle",":");');
uimenu(hls,'Label','实线','Call','set(hl,"LineStyle","-");');
uimenu(hlw,'Label','加宽','Call','set(hl,"LineWidth",2);');
uimenu(hlw,'Label','变细','Call','set(hl,"LineWidth",0.5);');
set(hl,'UIContextMenu',hc);
我介绍一下这个程序，就是plot会画出一条线，在那条线上点右键就能选择加宽或者实线虚线，可我在命令窗口运行了以后，出现了一下错误：??? Error: The input character is not valid in MATLAB statements or expressions.

??? Error while evaluating uimenu Callback.
请高手解释一下！