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 Apr 5 awarded Popular Question Jun 8 revised Efficient way for solving a matrix equation edited tags Jun 8 comment Efficient way for solving a matrix equation @Guesswhoitis Thanks for your comments. Probably it is not easy to explain exactly why I need this code, but generally I am trying to perform a non-linear dynamic analysis and in order to compute the Jacobian of the system with respect to the initial conditions, I need to solve a similar matrix equation at every time-step. Jun 8 asked Efficient way for solving a matrix equation Jul 14 awarded Popular Question Jan 19 awarded Popular Question Oct 31 comment Problem in exporting a plot with background to pdf The command I used to export the plot to pdf was Export. It did not work for me. Oct 31 comment Problem in exporting a plot with background to pdf @Nasser I did not get what you exactly mean. But if you need "backimage.jpg" which is imported in the code as the background, it is the first image of the post, as it is mentioned and provided above. Oct 31 comment Problem in exporting a plot with background to pdf Just wanted to mention that my version number is 8.0.4.0 and platform is Microsoft Windows 7 (64-bit). Oct 31 asked Problem in exporting a plot with background to pdf Mar 11 comment An issue regarding Eigenvalues function @bill s Could you please try it for larger values of mm? Mar 11 revised An issue regarding Eigenvalues function edited body Mar 11 comment An issue regarding Eigenvalues function @sebhofer I am using V 8.0.4.0 on windows 7, 64 bit. Do you get zero for larger values of mm as well? Mar 11 comment An issue regarding Eigenvalues function @Nasser, if you repeat this example for larger values of mm (like mm=2000), do you get zero again? Mar 11 comment An issue regarding Eigenvalues function @rcollyer, thank you for your comments, but still I cannot see where the problem is. Whatever we get from Eigenvalues function is stored in EIG vector, but when we take Eigenvalues results from EIG, a slight difference appears. I am wondering what is the source of these small values in the output vector. I have same problem in a big program in which these values are not as small as this example and cannot be resolved by chop. Mar 11 asked An issue regarding Eigenvalues function Feb 28 awarded Nice Question Feb 28 comment Eigenvalues and Determinant of a large matrix @Mark McClure Thank you for your comment, but what can I do to compute the exact eigenvalues and determinant of such a huge matrix? Feb 28 comment Eigenvalues and Determinant of a large matrix @DanielLichtblau Still a question is left in my mind, can I trust the values obtained as eigenvalues or determinant of a large matrix (like m) by Mathematica or not?? If no, how I can compute the exact values for such a matrix using Mathematica?? Cheers. Feb 27 asked Eigenvalues and Determinant of a large matrix