how to analyze matrix array with respect to other matrix?

Hi please help in analysing matrices. I have three matrices ,that is, two column matrices of latitude and longitude of dimension 4149*1 and one data matrix of dimension 4149*125.i want to select latitude value (say 0-2.5,2.5-5 and so on.. upto 37.5-40 ) and should select the same data point in the respective matrices and measure the frequency of some particular data point say d1 in the data matrix and the result should save in another matrix.