Hello all, I am a new forum member developing a spreadsheet to perform analysis using the finite element method. I need to invert a matrix larger than 256x256, possibly on the order of 1000'sx1000's. I get a #N/A for all values greater than 256. I am fairly experienced in Excel, but relatively weak in VBA. I typically record Macros, and go into the VBA editor to review and modify them. I have heard rumors that it is fairly easy to program a VBA code to invert a large matrix. Can anyone help?