Say I have a very large vector or matrix M and I want to do M*M’ to obtain say a time by time matrix. This doesn’t work for huge matrices. I guess the issue is memory? Are there any common ways to solve this?

Matmul for large (“tall”) data

Oscar_Smith October 14, 2026, 6:58pm 21

This is diagv = true*diagv + true*X*Xi' (using true==1)

Topic		Replies	Views
Fast `diag(A' * B * A)` General Usage performance , linearalgebra	22	1228	May 4, 2023
Diagonal elements of matrix product General Usage question , performance , linearalgebra	12	2869	November 2, 2022
Possible speedup in matrix-diagonal products? Performance linearalgebra , matrices	6	809	May 7, 2025
Fastest matrix multiplication General Usage mkl , linearalgebra , matrix	20	2324	February 19, 2024
Efficient approach to multiply three matrices (M1M2M3) and two vectors and a matrix (xMy) Performance linearalgebra	18	6635	July 10, 2023