我在从GUI执行simulink时遇到问题，谁知道这是怎么回事？

[poster]

我试图从GUI的编辑文本中绘制“ t vs y”设置的一些值，其中之一以“ tfinal”作为“停止时间”，但是当我运行代码时，它不会替换它，并在出现以下错误时显示尝试更换它：（*希望您能帮助我）

Error evaluating expression 'tfinal' for 'StopTime' specified in the Configuration Parameters dialog for block diagram 'gui_sim_model'. . . . Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)gui_adv_sim('pushbutton1_Callback',hObject,eventdata,guidata(hObject)) - Show complete stack trace Caused by: Error using gui_adv_sim>pushbutton1_Callback (line 184) Unrecognized function or variable 'tfinal'. - Showcomplete stack trace Error using gui_adv_sim>pushbutton1_Callback (line 184) Variable 'tfinal' has been deleted from base workspace. Gui中的代码（按钮）：

function pushbutton1_Callback(hObject, eventdata, handles) % hObject handle to pushbutton1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) global tfinal vfinal abty tfinal = str2double(get(handles.tf,'String')); vfinal = str2double(get(handles.vf,'String')); a = str2double(get(handles.aval,'String')); b = str2double(get(handles.bval,'String')); sim('gui_sim_model'); axes(handles.axes1) plot(t,y) xlabel('time in seconds') ylabel('value of y') Simulink： https ： //i.stack.imgur.com/IchLG.png

界面： https ： //i.stack.imgur.com/T08lf.png



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