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January 4th, 2009, 12:59 PM  #1 
Newbie Joined: Jan 2009 Posts: 1 Thanks: 0  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!! 
January 5th, 2009, 03:54 PM  #2 
Global Moderator Joined: May 2007 Posts: 6,763 Thanks: 697  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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