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January 4th, 2009, 12:59 PM   #1
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Is this simple 4x4 matrix invertible? Thanks!

Hello, straightforward question. Is this 4x4 matrix invertible?

1 0 0 0
0 1 0 0
0 0 0 1
0 0 1 0

I thought so, but Adobe Flash ActionScript's Matrix3D class refuses to accept the above matrix values, claiming the matrix would not be invertible, so now I'm in doubt.

Thanks in advance!!
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January 5th, 2009, 03:54 PM   #2
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Re: Is this simple 4x4 matrix invertible? Thanks!

It looks to me that the matrix is its own inverse, i.e. square the matrix and get the identity.
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