There is a bug in the function:
The bug is on row 514 of the file turbo.cpp. That row
needs to be corrected like this:
col = U(row,i); //Bugfix 2002-02-22, old code: col =
Thanks to Dingus-Jan Moelker for finding the bug.
This bug is in versions 3.6.0-3.6.3 of it++.