https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Pardiso-error-7-diagonal-matrix-problem/m-p/817461#M4428 Hi!<BR /><BR />When using Pardiso, I got an error : diagonal matrix problem. What does that mean? There are numbers on the diagonale that are not correct? There is a zero pivot? How can I solve this?<BR /><BR />Thanks and have a good day!<BR /> Mon, 17 May 2010 15:25:36 GMT xdominique 2010-05-17T15:25:36Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Pardiso-error-7-diagonal-matrix-problem/m-p/817461#M4428 Hi!<BR /><BR />When using Pardiso, I got an error : diagonal matrix problem. What does that mean? There are numbers on the diagonale that are not correct? There is a zero pivot? How can I solve this?<BR /><BR />Thanks and have a good day!<BR /> Mon, 17 May 2010 15:25:36 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Pardiso-error-7-diagonal-matrix-problem/m-p/817461#M4428 xdominique 2010-05-17T15:25:36Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Pardiso-error-7-diagonal-matrix-problem/m-p/817462#M4429 Hi,<DIV><SPAN style="font-family: Verdana, Arial, Helvetica, sans-serif;"><BR /></SPAN></DIV><DIV><SPAN style="font-family: Verdana, Arial, Helvetica, sans-serif;">This error means that your matrix is singular, namely, 7th element is zero. If you want to solve this matrix, please try to perturb all zero diagonal elements with some small non-zero value (1e-16 for example).</SPAN></DIV><DIV><SPAN style="font-family: Verdana, Arial, Helvetica, sans-serif;"><BR /></SPAN></DIV><DIV><SPAN style="font-family: Verdana, Arial, Helvetica, sans-serif;">Diagonal matrices are handled separately in PARDISO: in particular, we make more checks for this type of matrices such as checking for singularity that is not possible for non-diagonal matrices. But it's definitely a gap in MKL PARDISO documentation, we will try to fix it.</SPAN></DIV><DIV><SPAN style="font-family: Verdana, Arial, Helvetica, sans-serif;"><BR /></SPAN></DIV><DIV><SPAN style="font-family: Verdana, Arial, Helvetica, sans-serif;">Please fell free to ask more questions!</SPAN></DIV><DIV><SPAN style="font-family: Verdana, Arial, Helvetica, sans-serif;"><BR /></SPAN></DIV><DIV><SPAN style="font-family: Verdana, Arial, Helvetica, sans-serif;">Regards,</SPAN></DIV><DIV><SPAN style="font-family: Verdana, Arial, Helvetica, sans-serif;">Konstantin<BR /></SPAN><DIV></DIV></DIV> Wed, 19 May 2010 04:02:23 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Pardiso-error-7-diagonal-matrix-problem/m-p/817462#M4429 Konstantin_A_Intel 2010-05-19T04:02:23Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Pardiso-error-7-diagonal-matrix-problem/m-p/817463#M4430 One more note:<DIV></DIV><DIV>In fact, PARDISO is purposed for solving non-singular matrices and solving the matrix with the pertrubed diagonal elements is not completely correct. Even if the system will be solved there's no guaranty that produced solution will be unique.</DIV><DIV></DIV><DIV>You may also attach the matrix if you want we make a bit more analisys.</DIV><DIV></DIV><DIV>Regards,</DIV><DIV>Konstantin</DIV> Wed, 19 May 2010 06:02:40 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/Pardiso-error-7-diagonal-matrix-problem/m-p/817463#M4430 Konstantin_A_Intel 2010-05-19T06:02:40Z