求解释下这个matlab程序 各种不懂啊!

求解释下这个matlab程序 各种不懂啊!h0=figure('toolbar','none',...'position',[198 56 408 468],...'name','实例50');h1=axes('parent',h0,...'position',[0.29 0.45 0.7 0.5],...'visible','on');f=uicontrol('parent',h0,...'style','frame',...'position',[5 50 90 400]);p1=uicontrol('parent',h0,...'style','pushbutton',...'position',[150 100 60 40],...'string','绘图',...'callback',[...'m=str2num(get(e1,''string''));,',...'n=str2num(get(e2,''string''));,',...'a=get(l1,''value'');,',...'x=m:0.1:n;',...'if a==1,',...'plot(x,sin(x)),',...'end,',...'if a==2,',...'plot(x,cos(x)),',...'end,',...'if a==3,',...'plot(x,exp(x)),',...'end']);p2=uicontrol('parent',h0,...'style','pushbutton',...'position',[270 100 60 40],...'string','关闭',...'callback','close');l1=uicontrol('parent',h0,...'style','listbox',...'position',[10 300 80 80],...'string','sin(x)|cos(x)|exp(x)',...'value',1,...'max',0.5,...'min',0);f2=uicontrol('parent',h0,...'style','text',...'string','选择函数',...'fontsize',10,...'position',[10 380 80 20]);r1=uicontrol('style','radio',...'string','grid on',...'value',0,...'position',[10 100 60 20],...'callback',[...'grid on,',...'set(r1,''value'',1);,',...'set(r2,''value'',0)']);r2=uicontrol('style','radio',...'string','grid off',...'position',[10 80 60 20],...'value',1,...'callback',[...'grid off,',...'set(r2,''value'',1);,',...'set(r1,''value'',0)']);e1=uicontrol('parent',h0,...'style','edit',...'string',0,...'position',[20 210 60 20],...'horizontalalignment','right');e2=uicontrol('parent',h0,...'style','edit',...'string','3',...'position',[20 150 60 20],...'horizontalalignment','right');t1=uicontrol('parent',h0,...'style','text',...'string','X from',...'fontsize',10,...'position',[20 230 60 20],...'horizontalalignment','center');t2=uicontrol('parent',h0,...'style','text',...'string','To',...'fontsize',10,...'position',[20 170 60 20],...'horizontalalignment','center');