topic Re: Convert matlab function EXPM to SAS code in SAS/IML Software and Matrix Computations

Convert matlab function EXPM to SAS code

di_niu0 — Tue, 03 Dec 2024 22:38:05 GMT

Hi there. I am converting some Matlab code to SAS code. In Matlab, there is a built-in function that calculates the matrix exponential of a matrix called EXPM. There is no such built-in function for PROC IML. Does anyone know how to write the SAS code to produce the same result as EXPM? Thank you!

Re: Convert matlab function EXPM to SAS code

data_null__ — Tue, 03 Dec 2024 23:06:52 GMT

I think you need IML EXP function.

proc iml;
   /* Define the matrix A */
   A = {0 1, -1 0};

   /* Compute the matrix exponential */
   expA = exp(A);

   /* Print the result */
   print expA;
quit;

Re: Convert matlab function EXPM to SAS code

Ksharp — Wed, 04 Dec 2024 01:10:56 GMT

https://blogs.sas.com/content/iml/2023/05/03/geometry-exponential-of-matrix.html

Re: Convert matlab function EXPM to SAS code

Rick_SAS — Wed, 04 Dec 2024 10:55:11 GMT

@di_niu0 wrote:

Hi there. I am converting some Matlab code to SAS code. In Matlab, there is a built-in function that calculates the matrix exponential of a matrix called EXPM. There is no such built-in function for PROC IML. Does anyone know how to write the SAS code to produce the same result as EXPM? Thank you!

I think you are mistaken. The SAS IML language has supported the EXPMATRIX function, which computes the exponential of a matrix, for 20+ years.