How to read a numerical value from a static text box?

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Vivien Bartis
Vivien Bartis 2021-1-4
评论： Rik 2021-1-4
I tried it like this, but it won't use the value to calculate and plot the sine wave.
function pushbutton2_Callback(hObject, eventdata, handles)
f=num2str(get(handles.text6,'String'));
t=0:0.01:1;
b=sin(2*pi*f*t);
axes(handles.axes1);
plot(b);
This is where I calculate the f, with another pushbutton
function pushbutton1_Callback(hObject, eventdata, handles)
r=handles.edit1;
c=handles.edit2;
f=1/(2*pi*r*c);
set(handles.text6,'String',strcat(num2str(f*1000,2),' Hz'))

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回答（2 个）

Maximilian Schönau
Did you try str2double instead of num2str? ;)
Rik
Rik 2021-1-4
You need to strip the unit from the char array. Best practice is to keep numeric fields as pure as possible. With the uifigure-tools it is possible to enforce this during input, but in this case you need to remove it yourself:
function pushbutton2_Callback(hObject, eventdata, handles)
f=get(handles.text6,'String');%retrieve value from text field
f=strrep(f,'Hz','');%remove unit
f=num2str(f);%convert to value
t=0:0.01:1;
b=sin(2*pi*f*t);
plot(t,b,'Parent',handles.axes1);
% ^^ are you sure you don't want this instead of only b?
end

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