87 lines
1.8 KiB
C
87 lines
1.8 KiB
C
/* matrix transpose
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*
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* Copyright: 1990, K. Martinez and J. Cupitt
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*
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <vips/vips.h>
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/**
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* im_mattrn:
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* @in: input matrix
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* @filename: name for output matrix
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*
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* Transposes the input matrix.
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* Pass the filename to set for the output.
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*
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* See also: im_matmul(), im_matinv().
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*
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* Returns: the result matrix on success, or %NULL on error.
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*/
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DOUBLEMASK *
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im_mattrn( DOUBLEMASK *in, const char *name )
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{
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int xc, yc;
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DOUBLEMASK *mat;
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double *out, *a, *b;
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/* Allocate output matrix.
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*/
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if( !(mat = im_create_dmask( name, in->ysize, in->xsize )) )
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return( NULL );
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mat->scale = in->scale;
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mat->offset = in->offset;
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/* Transpose.
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*/
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out = mat->coeff;
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a = in->coeff;
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for( yc = 0; yc < mat->ysize; yc++ ) {
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b = a;
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for( xc = 0; xc < mat->xsize; xc++ ) {
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*out++ = *b;
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b += in->xsize;
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}
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a++;
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}
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return( mat );
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}
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