### MATRIX ALGEBRA

I have a matrix A. Let's say 10 columns and 50 rows. Problem: I want to delete rows 25 to 30, and use the remaining part of the matrix in the calculations. I checked the Shazam manual (pp. 406-407), but the example was not easy to ~~understand.~~understand. Any good ideas how to delelete rows (and columns)?

Regards,
TL