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Liam M. Healy authored
Move user-friendly linear algebra from GSLL, update the invert-matrix function to use optional arguments in GSLL functions and return the determinant as the second value, and add a determinant function. Also copy the input matrix in these two functions because gsl:LU-decomposition alters the input matrix. Test with (* (invert-matrix gsl::*vander4*) gsl::*vander4*).
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