[求助]如何制作这样的矩阵运算的matlab gui简单界面

[121794011]

本人刚开始学习Matlab，感觉到他对数学很有用处，特别是矩阵，正在摸着石头过河学习，想编写这样一个界面


就是有两个输入框让你输入X和Y的数值，点击下面的计算，就能算出来3x—4y的值，请求各位老师能解决
最好是能讲解一下，或者给个思路，小弟不胜感激

[xiezhh]

function test
OldHandle=findobj( 'Type', 'figure', 'Tag', 'test' );
if ishandle( OldHandle )
close( OldHandle );
end
fig=figure;
set(fig,'units','normalized','position',[0.2 0.2 0.6 0.7],...
'menubar','none','name','计算',...
'numbertitle','off','color',[79 129 188]/255,'tag','test');
backcolor=get(gcf,'Color');
uicontrol(gcf,'style','text','units','normalized','pos',[0.2 0.8 0.2 0.05],'string','请输入X的值',...
'fontsize',14,'fontweight','bold','fontunits','normalized','bac',backcolor)
uicontrol(gcf,'style','edit','units','normalized','pos',[0.2 0.7 0.2 0.08],...
'fontsize',14,'fontunits','normalized','string','','tag','edit1','backgroundcolor',[156 186 88]/255);

uicontrol(gcf,'style','text','units','normalized','pos',[0.6 0.8 0.2 0.05],'string','请输入Y的值',...
'fontsize',14,'fontweight','bold','fontunits','normalized','bac',backcolor)
uicontrol(gcf,'style','edit','units','normalized','pos',[0.6 0.7 0.2 0.08],...
'fontsize',14,'fontunits','normalized','string','','tag','edit2','backgroundcolor',[156 186 88]/255);

edit3=uicontrol(gcf,'style','edit','units','normalized','pos',[0.4 0.3 0.2 0.1],...
'fontsize',14,'fontunits','normalized','string','计算','tag','edit3',...
'backgroundcolor',[228 108 11]/255,'callback',...
['handles=guidata(gcf);'...
'x=str2num(get(handles.edit1,''string''));'...
'y=str2num(get(handles.edit2,''string''));'...
'set(handles.edit3,''string'',num2str(x+y));']);
set(edit3,'ButtonDownFcn',...
['handles=guidata(gcf);'...
'x=str2num(get(handles.edit1,''string''));'...
'y=str2num(get(handles.edit2,''string''));'...
'set(handles.edit3,''string'',num2str(x+y));'])
handles=guihandles(gcf);
guidata(gcf,handles);

[121794011]

谢谢你的回复，真的很感谢你