The Complete SPRLIB & ANNLIB

matrix

- a Numerical Recipes in C datatype

SYNOPSIS

int **imatrix (min_row, max_row, min_col, max_col)

double **matrix (min_row, max_row, min_col, max_col)

void *free_imatrix (im, min, max)

void free_matrix (m, min, max)

ARGUMENTS

int min_row The minimum row index.
int max_row The maximum row index.
int min_col The minimum column index.
int max_col The maximum column index.
int **im A matrix of integers.
double **m A matrix of doubles.

DESCRIPTION

In SPRANNLIB, the datatype used for matrices (and vectors) is the same as the type used in the Numerical Recipes in C functions. The only difference with a normal C array is that the first element is thought to have index 1; i.e., to fill a matrix with m by n units, the code is something like: 
int *v, i, j;

v = matrix (1, m, n);

for (i = 1; i <= n; i++)
{
  for (j = 1; j <= m; j++);
  {
    v[j][i] = j + i*m;
  }
}

The imatrix function can be used to allocate an integer matrix, matrix to allocate a matrix of doubles. The free_... function speak for themselves.

SEE ALSO

All the Numerical Recipe functions are described in, "Numerical Recipes in C, the Art of Scientific Computing", Second Edition, 1992, Cambridge University Press. vector

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