As the subject name suggets I have some problems running the dgecon routine to calculate the reciprocal condition number.

I make a LU-decomposition with the dgetrf-routine.

No problems there.

But in dgecon, the 5 parameter (standard ANORM) is an input estimate of the norm of the original matrix A. Dgecon then proceeds to calculate the condition number by calculating the norm of the inverse of A and multiplying this with your input.

However I can't find any routine to calculate the norm of A.

Does anybody have any suggestions.?

It would help me out a lot.