How to reduce size of matrix from 100 by 15 to 15 by 15

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I have a 100(rows) by 15 (coloumns). I want to make a 15 by 15 matrix by taking average or something. How can it be done?
Thank you
Jeffrey Clark
Jeffrey Clark on 16 Sep 2022
@SHUBHAM AGARWAL, looking at the corrcoef for the 100x15 and just a plot of these shows a strong correlation between the columns but not as much between the rows. You may be better off with reducing to a 100x1 with polynomials representing the differences for the other 14 columns: 100+14*3=142 vs 225 (15x15). This is the plot of col1 vs 2-15:

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