How to get 2-variable function from a GUI textbox?
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Peter weber
am 1 Sep. 2015
Bearbeitet: Peter weber
am 2 Sep. 2015
Hey
I need to input a 2 variable function like f(x,y) and give x and y lower and upper limit and use numerical methods on it. I did it for 1 variable function(find a GUI) but now there are problems with f(x) turnning into f(x,y) and fevel(fx,x) that cannot be (fx,x,y).
here is .m file and the problem area:
x1 = str2double(get(handles.editx1,'String'));
x2 = str2double(get(handles.editx2,'String'));
fx = vectorize(inline(get(handles.editfunc,'String')));
x = [x1:0.001:x2];
values = feval(fx,x);
maxi=max(values);
mini=(min(values));
if mini > 0
mini = 0;
end;
method = get(handles.pop_int,'Value');
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Walter Roberson
am 2 Sep. 2015
I recommend that you stop using inline() and start using str2func()
fx = str2func(['@(x,y)' vectorize(get(handles.editfunc,'String'))]);
values = fx(x, y);
I suspect you will also be wanting to use ndgrid() to construct the arguments you pass to your function.
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