PaulW
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 Dec 16 awarded Popular Question Feb 18 comment Symbolic Optimisation excellent thanks Feb 18 accepted Symbolic Optimisation Feb 18 awarded Supporter Feb 18 asked Symbolic Optimisation Feb 9 comment Obtaining the square-root of a general positive definite matrix Thanks - reducing it to a nearly-symmetric matrix solves the speed problem. One could use RootReduce[] as a hack too. Feb 9 awarded Scholar Feb 9 accepted Obtaining the square-root of a general positive definite matrix Feb 9 comment Obtaining the square-root of a general positive definite matrix sorry, that was unclear. I have edited and simplified the question (hopefully what I'm trying to achieve is clear now). Basically, I have a horrible square root to find , which will exist, but I don't actually need to know the analytical result, just which entries in the solution matrix will be different from zero. Feb 9 awarded Editor Feb 9 revised Obtaining the square-root of a general positive definite matrix deleted 195 characters in body Feb 8 comment Obtaining the square-root of a general positive definite matrix Is there a mapping rule I can use to test this? Feb 8 awarded Student Feb 8 comment Obtaining the square-root of a general positive definite matrix Hi guys, this was my post originally but I lost my account name form yesterday. The matrix comes from the solution to a algebraic ricatti equation. Now, I know F is positive semi definite since it comes from some transition and diffusion matrices in a statespace representation. Obviously this is going to be an ugly output, but thinking about it , I only need to know which elements of the solution are different from zero. Feb 7 asked Obtaining the square-root of a general positive definite matrix