"Involutory Matrix"

[kiyeo]

[Rick_SAS]

Please read this thread 

https://communities.sas.com/t5/SAS-IML-Software-and-Matrix/Skew-Symmetric-Matrices/m-p/720432

about how to ask homework-type questions.

[kiyeo]

Dear, thank you in advance. But you recommend me is about skew-symmetric matrix what I need is to create an Involutory Matrix.  

[Rick_SAS]

Here is what I wanted you to read:

when you ask for help you need to show what you've tried so far. Explain what you know and what you are confused about. Post some PROC IML code that indicates how you are attempting to solve the problem.

[Ksharp]

proc iml;
A = hadamard(4)/2;
I=A**2;
print A,I;
quit;

[Rick_SAS]

If your question is answered, please mark an answer as "Accepted" and mark the question as "Resolved." Otherwise, please let us know what additional information you need.