cuda-samples/Samples/2_Concepts_and_Techniques/eigenvalues/matlab.h

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/* Header for utility functionality.
 * Host code.
 */

#ifndef _MATLAB_H_
#define _MATLAB_H_

// includes, system
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// includes, project

////////////////////////////////////////////////////////////////////////////////
//! Write a tridiagonal, symmetric matrix in vector representation and
//! it's eigenvalues
//! @param  filename  name of output file
//! @param  d  diagonal entries of the matrix
//! @param  s  superdiagonal entries of the matrix (len = n - 1)
//! @param  eigenvals  eigenvalues of the matrix
//! @param  indices  vector of len n containing the position of the eigenvalues
//!                  if these are sorted in ascending order
//! @param  n  size of the matrix
////////////////////////////////////////////////////////////////////////////////
extern "C" void writeTridiagSymMatlab(const char *filename, float *d, float *s, float *eigenvals, const unsigned int n);

////////////////////////////////////////////////////////////////////////////////
//! Write matrix to a file in Matlab format
//! @param  file  file handle to which to write he matrix
//! @param  mat_name  name of matrix in Matlab
//! @param  mat  matrix to write to the file
//! @param  mat_size  size of the (square) matrix \a mat
////////////////////////////////////////////////////////////////////////////////
template <class T, class S> void writeMatrixMatlab(T &file, const char *mat_name, S *&mat, const unsigned int mat_size);

////////////////////////////////////////////////////////////////////////////////
//! Write vector to a file in Matlab format
//! @param  file  file handle to which to write he matrix
//! @param  vec_name  name of vector in Matlab
//! @param  vec  matrix to write to the file
//! @param  vec_len  length of the vector
////////////////////////////////////////////////////////////////////////////////
template <class T, class S> void writeVectorMatlab(T &file, const char *vec_name, S *&vec, const unsigned int vec_len);

// implementations

////////////////////////////////////////////////////////////////////////////////
//! Write matrix to a file in Matlab format
//! @param  file  file handle to which to write he matrix
//! @param  mat_name  name of matrix in Matlab
//! @param  mat  matrix to write to the file
//! @param  mat_size  size of the (square) matrix \a mat
////////////////////////////////////////////////////////////////////////////////
template <class T, class S> void writeMatrixMatlab(T &file, const char *mat_name, S *&mat, const unsigned int mat_size)
{
    const unsigned int pitch = sizeof(S) * mat_size;

    file << mat_name << " = [";

    for (unsigned int i = 0; i < mat_size; ++i) {
        for (unsigned int j = 0; j < mat_size; ++j) {
            file << getMatrix(mat, pitch, i, j) << " ";
        }

        if (i != mat_size - 1) {
            file << "; ";
        }
    }

    file << "];\n";
}

////////////////////////////////////////////////////////////////////////////////
//! Write vector to a file in Matlab format
//! @param  file  file handle to which to write he matrix
//! @param  vec_name  name of vector in Matlab
//! @param  vec  matrix to write to the file
//! @param  vec_len  length of the vector
////////////////////////////////////////////////////////////////////////////////
template <class T, class S> void writeVectorMatlab(T &file, const char *vec_name, S *&vec, const unsigned int vec_len)
{
    file << vec_name << " = [";

    for (unsigned int i = 0; i < vec_len; ++i) {
        file << vec[i] << " ";
    }

    file << "];\n";
}

#endif // _MATLAB_H_