full width at half maximum

2015 10 14
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更新时间：2015 10 14
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Hello all I have a curve shape plot and Im using the codes below to find the two Xs associated with the y at half Max % halfMaxLeftIndex = find(y>=maxY/2, 1, 'first'); % halfMaxRightIndex = find(y>=maxY/2, 1, 'last')
gives me the error below
halfMaxLeftIndex =
Empty matrix: 1-by-0
Could you please advise
thanks

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Adam
Adam 2015-10-14

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Have you defined maxY somewhere?
An empty matrix is not an error, it just means that the find operation did not find any elements of the array meeting your criterion.
find( y >= max(y)/2, 1, 'first' );
should certainly never return an empty matrix but with your version, if maxY is undefined or incorrectly defined it might.

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