SOLUTION: examples of idempotent matrix

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Question 1012581: examples of idempotent matrix
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
Given a 2x2 matrix
a b
c d
Pick any value for a you want, make d = 1 - a, and then pick b and c
so that b*c = a*d. That will give you an idempotent matrix.