f=get(handles.edit1,'string'); a=str2num(get(handles.edit2,'string')); h=str2num(get(handles.edit3,'string')); t=get(handles.popupmenu1,'value'); switch t case 1 %opcione case 2 x=a+h; f1=eval(f); x=a; f0=eval(f); fd=(f1-f0)./h; set(handles.edit4,'string',fd); case 3 x=a-h; fa=eval(f); x=a; f0=eval(f); fd=(f0-fa)./h; set(handles.edit4,'string',fd); case 4 x=a-h; fa=eval(f); x=a+h; f1=eval(f); fd=(f1-fa)./(2.*h); set(handles.edit4,'string',f d); end
