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/**
* \file io.h
* \brief Input/output routines for matrices
*
* \author Martin Albrecht <martinralbrecht@googlemail.com>
*/
#ifndef M4RI_IO_H
#define M4RI_IO_H
/*******************************************************************
*
* M4RI: Linear Algebra over GF(2)
*
* Copyright (C) 2011 Martin Albrecht <martinralbrecht@googlemail.com>
*
* Distributed under the terms of the GNU General Public License (GPL)
* version 2 or higher.
*
* This code is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* The full text of the GPL is available at:
*
* http://www.gnu.org/licenses/
*
********************************************************************/
#include <m4ri/m4ri_config.h>
#include <m4ri/mzd.h>
/**
* \brief Print row i of M to an output stream.
*
* The output will contain colons between every 4-th column.
*
* \param stream Output stream
* \param M Matrix
* \param i Row to print
*/
void mzd_fprint_row(FILE* stream, mzd_t const *M, const rci_t i);
/**
* \brief Print row i of M to stdout.
*
* The output will contain colons between every 4-th column.
*
* \param M Matrix
* \param i Row to print
*/
static inline void mzd_print_row(mzd_t const *M, const rci_t i) {
mzd_fprint_row(stdout, M, i);
}
/**
* \brief Print a matrix to an output stream.
*
* The output will contain colons between every 4-th column.
*
* \param stream Output stream
* \param M Matrix
*/
static inline void mzd_fprint(FILE* stream, mzd_t const *M) {
for (rci_t i = 0; i < M->nrows; ++i) {
mzd_fprint_row(stream, M, i);
}
}
/**
* \brief Print a matrix to stdout.
*
* The output will contain colons between every 4-th column.
*
* \param M Matrix
*/
static inline void mzd_print(mzd_t const *M) {
mzd_fprint(stdout, M);
}
/**
* \brief Print compact information about the matrix to stdout.
*
* Prints number of rows, number of columns, density (and rank).
*
* \param A Matrix
* \param do_rank Also display the rank (expensive)
*/
void mzd_info(const mzd_t *A, int do_rank);
#if __M4RI_HAVE_LIBPNG
/**
* \brief Read matrix from 1-bit PNG image.
*
* This function returns a matrix on success and NULL otherwise. 1-bit
* Grayscale and 1-bit Palette images are supported.
*
* \param fn Filename
* \param verbose Print error message to stdout if != 0
*/
mzd_t * mzd_from_png(const char *fn, int verbose);
/**
* \brief Write matrix to 1-bit PNG image.
*
* This function returns zero on success and some value != 0
* otherwise. The parameter compression_level takes a zlib compression
* level, i.e., an integer betweeen -1 and 9 (inclusive) such that
*
\verbatim
#define Z_NO_COMPRESSION 0
#define Z_BEST_SPEED 1
#define Z_BEST_COMPRESSION 9
#define Z_DEFAULT_COMPRESSION (-1)
\endverbatim
*
* The optional comment string is written as a PNG comment.
*
*
* \param A Matrix
* \param fn Filename (must have write permission)
* \param compression_level Zlib compression level (see above)
* \param comment Optional comment (may be NULL)
* \param verbose Print error message to stdout if != 0
*/
int mzd_to_png(const mzd_t *A, const char *fn, int compression_level, const char *comment, int verbose);
#endif //__M4RI_HAVE_LIBPNG
/**
* \brief Read matrix from ASCII file in JCF format.
*
* The format is as follows:
\verbatim
nrows ncols modulus
nonzero_entries_upper_bound
column_index
\endverbatim
*
* where a negative column_index indicates a row_index increase by one and a non-zero entry at index
* -column_index.
*
* \note the JCF format is one-based in contrast to everything else in this library which is
* zero-based.
*
* For example, a valid input is:
\verbatim
3 2 2
3
-2
-1
-2
\endverbatim
*
* which produces the matrix
\verbatim
[0 1]
[1 0]
[0 1]
\endverbatim
*
*
* \param fn Filename
* \param verbose Print error message to stdout if != 0
*/
mzd_t *mzd_from_jcf(const char *fn, int verbose);
/**
* \brief Create matrix from dense ASCII string
*
* The provided string is parsed in row major ordering, i.e. the first entry is
* writen to A[0,0], the second entry to A[0,1] etc.
*
* For example, calling
\verbatim
mzd_t *A = mzd_from_str(4, 4, "1000010000100001");
\endverbatim
*
* would create a 4 x 4 identity matrix.
*
* \param m Number of rows
* \param n Nimber of columns
* \param str String containing ASCII zeros and ones of length m*n
*/
mzd_t *mzd_from_str(rci_t m, rci_t n, const char *str);
#endif //M4RI_IO_H
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