MATLAB: How can i get the x value for a chosen y value

chosencorrespondinggivenmaxmaximumvaluevaluesxy

I've plot my spectrum with "plot (abs(wave));". I successfully got my Y max value with "maxY = max(abs(wave))". But now I want the X axis value that corresponds to my maximum Y value. Anybody can help? Thank you in advance!

Best Answer

 [maxY index] = max(abs(wave));

index is either the X value, or something you can use to get the x values, eg,

 x = 1:54:23423 
 correspondingX = x(index);

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Something like this will work

x; % array of x-values
y; % array of y-values
[max_y, max_idx] = max(y);
x_max = x(max_idx);
interval = 0.02; % length of interval before and after peak
idx = (x_max-interval < x) & (x < x_max+interval);
x_interval = x(idx);
y_interval = y(idx);

x_interval and y_interval contain values in around the peak.

Best Answer

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