请教：如何在图形用户界面（GUI）中交互输入方程求解？

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如题，用可编辑文本框？可回调函数怎么能识别？

suffer

1. % 文本框输入矩阵并处理
   
2. close all
   
3. figure('position',[100,100,800,500])
   
4. cc='result of matrix +1';
   
5. H1=uicontrol(gcf,'style','text',...
   
6. 'unit','normalized','position',[0.03,0.03,0.45,0.8],...
   
7. 'BackgroundColor',[0.7 0.8 0.9],'ForegroundColor','b',...
   
8. 'string','show matrix','fontsize',14);
   
9. H2=uicontrol(gcf,'style','edit',...
   
10. 'unit','normalized','position',[0.53,0.03,0.45,0.8],...
    
11. 'BackgroundColor',[0.9 0.8 0.7],'ForegroundColor','b',...
    
12. 'string','input matrix','fontsize',12,'callback',...
    
13. ['aa=get(H2,''string'');','set(H1,''string'',aa);']);
    
14. set(H2,'Max',100)
    
15. H3=uicontrol(gcf,'style','push',...
    
16. 'unit','normalized','position',[0.53,0.85,0.12,0.08],...
    
17. 'BackgroundColor',[0.9 0.8 0.7],'ForegroundColor','b',...
    
18. 'string','matrix + 1','fontsize',12,'callback',...
    
19. ['bb=str2num(aa)+1;','set(H1,''string'',{aa;cc;num2str(bb)});']);

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谢谢suffer，可是这个代码好象只可以识别数字，对字符却视而不见啊。这样的话还是不能输入方程啊

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