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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
Oct
28
asked Problem with NDsolve for a system of equations