Using Lapack with C++ is giving me a small headache. I found the functions defined for fortran a bit eccentric, so I tried to make a few functions on C++ to make it easier for me to read what's going on. Anyway, I'm not getting th matrix-vector product working as...

I use blas/lapack in my C++ code built with CMake 2.8.9. I want to find BLAS and LAPACK libraries with the CMake commands : find_package(BLAS REQUIRED) find_package(LAPACK REQUIRED) But it can found it because the libraries are in a specific directory. The error is the following : CMake Error at...

I installed lapack 3.4.2 and 3.5.0 by compiling them with cmake. In my installation dir of lapack 3.5.0 I find a file ./pkgconfig/lapack.pc saying Version: 3.4.2. So I'm not sure I really installed lapack 3.5.0 there. Is there a way to obtain the version of lapack directly form the lib...

I've done my best recently to set up boost's numeric bindings to allow me to use LAPACK from C++, but I've run into some roadblocks. First off, I have confirmed that boost is working fine, so it's something to do with my LAPACK libraries or the boost numeric bindings. Here's...

According to MATLAB's documentation: [V,D] = eig(A,B) returns diagonal matrix D of generalized eigenvalues and full matrix V whose columns are the corresponding right eigenvectors, so that A*V = B*V*D. As I read available source code (It seems all implementations I've looked at Octave, R, Scipy) lead to LAPACK's DGGEV...

Folks, I'm calling LAPACKE_dptsv If all arguments are 1d arrays, does it matter if I call the data LAPACK_ROW_MAJOR or LAPACK_COL_MAJOR ?...

I am a novice using the LAPACK routines, so I don't deeply know them, and I want to use them in parallelized loops (openmp). I use Ubuntu 14.04LTS and have LAPACK installed using my package manager. The version installed is: liblapack3 3.5.0-2ubuntu1 Library of linear algebra routines 3 - shared...

Summary I am trying to write some MEX files that use LAPACK, and I thought I'd start by looking through the examples provided by MathWorks. However, I am having some trouble compiling them. After copying the matrixDivide.c example from [MATLAB root]/extern/examples/refbook into a working directory, I tried to build a...

I am trying to solve a linear system using the following code: #include <stdio.h> #include <lapacke.h> int main () { lapack_complex_double mat[4]; lapack_complex_double vec[2]; lapack_int p[2]; mat[0] = lapack_make_complex_double(1,0); mat[1] = lapack_make_complex_double(1,0); mat[2] = lapack_make_complex_double(1,0); mat[3] = lapack_make_complex_double(-1,0); vec[0] = lapack_make_complex_double(1,0); vec[1] = lapack_make_complex_double(1,0); LAPACKE_zgetrf(LAPACK_ROW_MAJOR, 2, 2, mat, 2, p);...

Hey I am trying to get my LAPACK libraries to work and I have searched and searched but I can't seem to figure out what I am doing wrong. I try running my code, and I get the following error Program received signal SIGSEGV: Segmentation fault - invalid memory reference....

I am trying for the first time to use LAPACK from C to diagonalize a matrix and I am stuck. I have been trying to modify this example http://rcabreral.blogspot.co.uk/2010/05/eigenvalues-clapack.html from zgeev to dgeev. I have looked at the DGEEV input parameters, http://www.netlib.org/lapack/explore-html/d9/d28/dgeev_8f.html but it seems I don't understand the well...

Why is there a blas subroutine ISAMAX for argmax abs but not for argmax ? In C++ using std::max_element with compiler optimisation flag -O3 I am getting speeds comparable to blas_isamax (16 ms vs 9 ms), so at the moment my question is more out of interest than out of...

I am trying to test the LAPACK method CGESV, but I am encountering an issue. I want to reuse my 'A' matrix in other parts of my code, but it changes when I pass it into the method. The definition of 'A': (input/output) COMPLEX array, dimension (LDA,N) On entry, the...

I have a very simple piece of C++ code justread.cc reading numbers from a file. After the command [email protected]:~/Desktop/tests$ g++ -Wall -pedantic -o justread.x justread.cc && ./justread.x it compiles without any errors or warnings. This is the code: #include <fstream> #include <vector> int read_covariance () { std::vector<double> data; double tmp;...

At the beginning I would like to apologise for my English. Now, let's go to my problem. I try to write a simple code which will find a solution of a system of linear equations: Ax = b where A is a square matrix nxn. In this program I use...

I'm trying to solve some linear equation (which is symmetrical, tridiagonal and positive). I have to use LAPACKE. My code is as follows: #include <lapacke.h> #include <stdio.h> void print_mtrx(double * mtrx, int n, int m) { int i, j; for(i = 0; i < n; i++) { for(j = 0;...

I have two programmes using the LAPACK routine dgeev in C. One appears to be working, the other does not compile claiming undefined reference to dgeev. I seek to understand why. The first code below - called mamapack.c - produces sensible results when compiled and run like this: [email protected]:~/Desktop/tests$ gcc...