I've just been doing some things to look at some wierd profiles and got it all looking nice, and then decided to tweak some parameters to see if I was in a local minimum and now Topas does a single iteration and fails with the error "Singular matrix in routine ludcmp"
Number of hkls generated for C:\TOPAS5\sg\fm-3m.sg 23
0 Time 0.31 Rwp 9.420 0.000 MC 0.00 0
1 Time 1.04 Rwp 9.420 0.000 MC 100.00 0
--- 1.045 seconds ---
*** Parameter(s) close to limit(s).
Check for LIMIT_MIN and LIMIT_MAX in Grid/Text
Singular matrix in routine ludcmp
What's going on?
How can I fix things? I've tried (as much as I could) to put the values back to something approaching their values when it was working, but no dice.