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.
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.
proc iml;
A = hadamard(4)/2;
I=A**2;
print A,I;
quit;
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.
Registration is open! SAS is returning to Vegas for an AI and analytics experience like no other! Whether you're an executive, manager, end user or SAS partner, SAS Innovate is designed for everyone on your team. Register for just $495 by 12/31/2023.
If you are interested in speaking, there is still time to submit a session idea. More details are posted on the website.
Learn how to run multiple linear regression models with and without interactions, presented by SAS user Alex Chaplin.
Find more tutorials on the SAS Users YouTube channel.