How to obtain max value of a plot
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ekko ekkosen
on 18 Mar 2015
Commented: Image Analyst
on 19 Mar 2015
i was wondering how to obtain the data of the peak from a plot (max Y value and its X position) with: x = linspace(0,20); F = sin(x) P1 = plot (x,F);
ok so from this how can i write a command that shows me that the first peak is at F = 1 and X = 1.57
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Accepted Answer
Image Analyst
on 18 Mar 2015
Try this:
maxF = max(F); % Find max value over all elements.
indexOfFirstMax = find(F == maxF, 1, 'first'); % Get first element that is the max.
% Get the x and y values at that index.
maxY = F(indexOfFirstMax);
maxX = x(indexOfFirstMax);
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Image Analyst
on 19 Mar 2015
Ok, using max() is an alternate way - it gives you the same information as what I gave here except with a different function. And you changed the name of x to t, but otherwise the code is equivalent so I'm not sure why you said it didn't find the first peak. By the way, you don't need to cast F to double.
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