<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Hi petsc4py users,</div><div><br></div><div>I am running into the following error:</div><br><blockquote type="cite"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Monaco; color: rgb(0, 39, 143); "><span style="color: #ff311c"> </span><span style="text-decoration: underline">File "/Users/cls/workspace/LAMG-Python/src/lamg/amg/setup.py", line 945, in buildInternal</span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Monaco; color: rgb(255, 49, 28); "> Acc = A[c, c]</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Monaco; color: rgb(255, 49, 28); "> File "Mat.pyx", line 185, in petsc4py.PETSc.Mat.__getitem__ (src/petsc4py.PETSc.c:71407)</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Monaco; color: rgb(255, 49, 28); "> File "petscmat.pxi", line 862, in petsc4py.PETSc.mat_getitem (src/petsc4py.PETSc.c:22442)</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Monaco; color: rgb(255, 49, 28); "> File "petscmat.pxi", line 773, in petsc4py.PETSc.matgetvalues (src/petsc4py.PETSc.c:21226)</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Monaco; color: rgb(255, 49, 28); "> File "arraynpy.pxi", line 123, in petsc4py.PETSc.iarray_i (src/petsc4py.PETSc.c:5284)</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Monaco; color: rgb(255, 49, 28); "> File "arraynpy.pxi", line 117, in petsc4py.PETSc.iarray (src/petsc4py.PETSc.c:5192)</div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px; font: normal normal normal 12px/normal Monaco; color: rgb(255, 49, 28); ">TypeError: Cannot cast array data from dtype('int64') to dtype('int32') according to the rule 'safe'</div></blockquote><br><div>I am indexing the PETSc.Mat A with an array c ( numpy.ndarray with dtype('int64')). I assume there is a simple solution (allowing the cast, making everything 32 or 64 bit...). Can you point me in the right direction? Thanks.</div><div><br></div><div>Chris</div><div><br></div><div><br></div></body></html>