Intel® Math Kernel Library

Eigenvalue problem for sparse matrices

Hi guys;

I'm trying to compute "dynamic mode shapes" in my fortran code, so I need to find either eigenvalues of a symmetric sparse matrix or the inverse of that matrix (the first method is prefered).
Is there any routine in BLAS or any spesific procedure that could help me?

thanks in advance
Hossein

MKL IA32 loses precision when compared with Cygwin Atlas Fortran Lapack

Environment - VS 2003 32bit - code written in C++ calling fortran interface to LAPACK

I have some heavy numerical software based on using dgelsd_ or DGELSD to do singular value decomposion many many times with small 12x12 matrices. I have been linking my executables to a library built using the ifor build of LAPACK built in cygwin and using mingw libraries to provide the (very few) system calls these lapack libraries require that are not provided by the Windows environment.

dss_solve_real in parallel?

I'm using the dss routines in version 10.0.3.020 of the intel mkl solver for linux. I am able to compile and run my program without a problem. My sparse matrix is fairly large and cpu intensive, so I use multiple threads on a server with multiple cpus. I run the reorder and factorization routines once at the beginning of my program, and they appear to use multiple cpus according to top. I can also increase or decrease the solution time of the other dss processes by increasing or decreasing the number of cpus.

error LNK2019: unresolved external symbol _PARDISO referenced in function

CPU : Intel Core 2
OS : Windows XP
Compiler : Intel Visual Fortran Prof. ed for Wind (Trial Version)
Environment : Visual Studio 2005 Professional ed.

I downloaded Visual Fortran compiler and compiled sample code from VS2005
However, thereare link errors as followings

dtrnlspbc_init problem

Hi, All,
when i use the trust region algorithm, i meet some problem with "dtrnlspbc_init"
What i got is the return of "TR_INVALID_OPTION"
I have checked my parameters, it seems there is no obvious error.
I don't know what else situation, such kind of return may happen?
thank you very much!

Installation Error

I got the "l_mkl_p_10.0.1.014.tgz". but It showed errors such as following
Would you like to install the following?
Intel Math Kernel Library 10.0 Update 1 for Linux*
to continue, or x to exit:

Extracting... ######################################################################################### [100%]./.././install/install: line 1673: 7470 Segmentation fault "$temp_dir/$installer" --installdata "$temp_dir/installdata" $0 "$temp_dir" "$dashfix" "$nonrpm" "$@"

Rearranging Matrix elements

Hi all,

i need to perform a 2D FFT on a matrix u(i,j). Unfortunately, in my model FFT has a symmetric summation from -N to N, while the MKL FFT routine has a biased summation (from 0 to 2N). Hence, I need to rearrange the input matrix, swapping sub-bocks (quadrants), in order to achieve the correctposition for u elements.

matrix-vector multiplication

hey,
i have been working on matrix-vector multiplication using mkl (sparseBLAS routines). I used mkl_cspblas_dcsrgemv function for this. But the code doesn't use both the processors of the dual core machine. I tries the test function cblas_dgemm to see if it uses both the processors, and found that when i set MKL_NUM_THREADS=2 in bash, it uses both the processors but with MKL_NUM_THREADS=1, it uses only single processors. But this thing doesn't work with mkl_cspblas_dcsrgemv function.

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