<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><div><br></div><div><br></div><div><font size="5">All,</font></div><div><font size="5"><br></font></div><div><font size="5">I have a general question about a structured non-uniform grid.</font></div><div><font size="5"><br></font></div><div><font size="5">I have set the coordinates X,Y,Z in my code by first calling setUniformGrid and then by setting the coordinates.</font></div><div><font size="5">I have printed out the coordinates and those are as expected.</font></div><div><font size="5"><br></font></div><div><font size="5">I an non-uniform grid the code will need a specific delta_x delta_y and delta_z since they will differ through out the grid.</font></div><div><font size="5"><br></font></div><div><font size="5">Does PETSc take a derivative of the coordinates (by default) to get the list of delta’s or do I need to do something specific ?</font></div><div><font size="5"><br></font></div><div><font size="5">Many Thanks in Advance</font></div><div><font size="5">John</font></div><div><font size="5"><br></font></div><div><font size="5"><br></font></div><div><font size="5"><br></font></div></body></html>