thanks a lot. the manual is not clear on the applicability of QR_solve(),
"Function: int gsl_linalg_QR_solve (const gsl_matrix * QR, const
gsl_vector * tau, const gsl_vector * b, gsl_vector * x)
This function solves the system A x = b using the QR decomposition of
A into (QR, tau) given by gsl_linalg_QR_decomp"
is the sum total of the entry!
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