When changing the pivot point but using an old covariance matrix it's a good idea to increase MPI_Max_R_ProposeUpdate, e.g. to 50. Or, even better, post-process your original chain to the new pivot point, calculate a covariance matrix from that, and use that for the new proposal.
In case of use here is a k=0.002 .covmat for a basic 7-parameter model (normal+A_{SZ})
Code: Select all
0.37746E-06 0.47512E-06 0.12444E-05 0.26567E-05 0.00000E+00 0.00000E+00 0.00000E+00 0.70331E-05 0.00000E+00 0.00000E+00 -0.11470E-04 0.00000E+00 0.32868E-04
0.47512E-06 0.38350E-04 0.48219E-05 -0.21296E-04 0.00000E+00 0.00000E+00 0.00000E+00 -0.83625E-05 0.00000E+00 0.00000E+00 0.14088E-03 0.00000E+00 -0.22025E-03
0.12444E-05 0.48219E-05 0.95613E-05 0.67625E-05 0.00000E+00 0.00000E+00 0.00000E+00 0.26676E-04 0.00000E+00 0.00000E+00 -0.33425E-04 0.00000E+00 -0.49732E-05
0.26567E-05 -0.21296E-04 0.67625E-05 0.29354E-03 0.00000E+00 0.00000E+00 0.00000E+00 0.91830E-04 0.00000E+00 0.00000E+00 0.24973E-03 0.00000E+00 -0.23492E-03
0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
0.70331E-05 -0.83625E-05 0.26676E-04 0.91830E-04 0.00000E+00 0.00000E+00 0.00000E+00 0.20327E-03 0.00000E+00 0.00000E+00 -0.38090E-03 0.00000E+00 -0.83922E-03
0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
-0.11470E-04 0.14088E-03 -0.33425E-04 0.24973E-03 0.00000E+00 0.00000E+00 0.00000E+00 -0.38090E-03 0.00000E+00 0.00000E+00 0.21115E-02 0.00000E+00 -0.61157E-03
0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00 0.00000E+00
0.32868E-04 -0.22025E-03 -0.49732E-05 -0.23492E-03 0.00000E+00 0.00000E+00 0.00000E+00 -0.83922E-03 0.00000E+00 0.00000E+00 -0.61157E-03 0.00000E+00 0.32622E+00