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/* matrix catenate
*
* 1994, K. Martinez
*
* 22/10/10
* - gtk-doc
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>
#include <stdio.h>
#include <string.h>
#include <vips/vips.h>
/**
* im_matcat:
* @top: input matrix
* @bottom: input matrix
* @filename: filename for output
*
* Matrix catenations. Returns a new matrix which is the two source matrices
* joined together top-bottom. They must be the same width.
*
* See also: im_mattrn(), im_matmul(), im_matinv().
*
* Returns: the joined mask on success, or NULL on error.
*/
DOUBLEMASK *
im_matcat(DOUBLEMASK *top, DOUBLEMASK *bottom, const char *filename)
{
int newxsize, newysize;
DOUBLEMASK *mat;
double *out;
/* matrices must be same width
*/
if (top->xsize != bottom->xsize) {
im_error("im_matcat", "%s",
_("matrices must be same width"));
return NULL;
}
newxsize = top->xsize;
newysize = top->ysize + bottom->ysize;
/* Allocate output matrix.
*/
if (!(mat = im_create_dmask(filename, newxsize, newysize)))
return NULL;
/* copy first matrix then add second on the end
*/
memcpy(mat->coeff, top->coeff,
top->xsize * top->ysize * sizeof(double));
out = mat->coeff + top->xsize * top->ysize;
memcpy(out, bottom->coeff,
bottom->xsize * bottom->ysize * sizeof(double));
return mat;
}
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