Finding the turning points
显示 更早的评论
Hi i want to ask about something, i want to solve and locate the turning points (maximum and minimum point) of a graph using matlab gui but i dont know how to code it. The function is user defined and here is my code:
funcString = get(handles.edit1,'String');
funcHandle = str2func(['@(x)' funcString]);
x = linspace(10,-10,100);
y = funcHandle(x);
plot(handles.axes1,x,y);
3 个评论
Torsten
2023-5-1
So you want to determine minima and maxima of the first derivative of your "funcHandle" ?
Reynand Joe
2023-5-2
Image Analyst
2023-5-2
回答（1 个）
John D'Errico
2023-5-1
0 个投票
If all you will use are the 100 coarsely sampled points you are plotting, then min and max will do what you want. Look at the second arguments returned from min and max. You could also use findpeaks.
If you are willing to use the function itself, then you might use fminbnd. Note that fminbnd always searches fro a minimum. But you could then search for the minimum of -f(x), which would be the maximum of f.
类别
在 帮助中心 和 File Exchange 中查找有关 Images 的更多信息
2023-5-1
2023-5-2
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
