Finding max index on imported matrix

Hi, i'm sorry for my bad English.

I have a fileMathcad thatcalculatesevery meterthe evolution of thebending moment, shear andreactions during an incremental launching bridge.

This file, save 3 file .txt with a big matrix (221x263) (one for banding moment, one for shear and one for reactions).

I need to create e new file that import bending_moment.txt and find the maximum value in a rows and tell me the index about this max value.

I tray to use the command match....but this work with a smal matrix that i have manually created, and he don't work with the imported matrix.

Find the max value and his index is important for me, because i need this information for apply some formulas from Eurocode!

Thanks

Marco