how to find local peaks in dataset

Hello,I have a matrix with size 256*2 matrix=[0 1 2 3 4 ...256; 0 3 4 8 0 ...673]. first column shows intensity and second shows iteration of each intensity in image. I want to find local peaks.but findpeaks can not find all peaks.can any one help me to find local peaks?

[dpb]

Probably will have to see the dataset to have any chance of anybody being able to help...nothing much to (as in anything) to go on here...