I have to perform the exponential of a matrix. I have compared the built-in exp function to the exponential! function from the ExponentialUtilites package. The latter is supposed to be much faster than the built-in function. However, I don’t see this! A = randn(2^12, 2^12) @time exp(im*A); 71.589…

Fast Exponential of a large matrix

Oscar_Smith July 14, 2024, 9:28am 7

expv which uses krylov methods is likely much better here.

4 Likes

Topic		Replies	Views
Reusing eigendecomposition for matrix exponentials General Usage	6	391	November 21, 2020
Status of exp and sqrt Internals & Design	30	8338	June 12, 2017
ExponentialUtilities.jl expv!() allocations Numerics question , package	11	340	June 23, 2025
How to efficiently exponentiate a complex (symmetric) tridiagonal matrix? Performance question , performance , linearalgebra , memory	6	1667	March 12, 2021
Matrix exponential * vector for various scales Numerics question	38	1624	April 9, 2024