Problem inverting complex matrix

[parisse]

(12-21-2019 08:43 PM)jesuscf Wrote:  

(12-21-2019 04:52 PM)parisse Wrote:  As I said, approx(inv(exact(...))) does the job.

approx(inv(exact(...))) takes over 15 seconds to produce the result.

This is expected since computations are done with rationals.
After more tracing with the numeric algorithm, I discovered that it failed because checking of non zero pivot failed: inv(M1) fails while inv(1000*M1) works. This should now be fixed in the source code.