topic Re: how to get inverse matrix in SAS/IML Software and Matrix Computations

how to get inverse matrix

Yanni_C — Fri, 15 Dec 2023 08:58:00 GMT

I have a matirx datasetA (7*7), and I want to get the inverse matrix of this datasetA and save this inverse matrix in datasetB. Could you please tell me how to implement it using sas?

Re: how to get inverse matrix

Ksharp — Fri, 15 Dec 2023 09:13:54 GMT

It is IML thing. You'd better post it at IML forum

https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/bd-p/sas_iml

,and calling @Rick_SAS

data A;
input a1-a7;
cards;
1 2 9 5 5 6 7
4 2 3 1 5 6 4
1 4 6 2 9 6 3
6 8 7 3 8 6 2
8 7 8 8 9 6 1
3 1 3 9 1 6 6
2 7 3 4 2 6 7
;


proc iml;
use A;
read all var _all_ into a[c=vname];
close;
inv_a=inv(a);
create B from inv_a[c=vname];
append from inv_a;
close;
quit;

Re: how to get inverse matrix

Yanni_C — Fri, 15 Dec 2023 09:19:16 GMT

Thank you very much! Really helpful!