insert a small matrix inside a big matrix
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i have a 1000 x 1000 matrix and a 45 x 45 matrix. both have random numbers. how can i insert the small matrix in the bigger one at a given location. lets say i want to insert the small matrix from 250 x 250 onwards. How do i do it ? I do not want the elements of the big matrix to become zero for all other places left after inserting the smaller matrix, i mean padding the small matrix with zeros wont be helpful in this case. Please assist.