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Mshift1.c
69 lines (54 loc) · 1.84 KB
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Mshift1.c
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/* Generate shifts for 1-D regularized autoregression. */
/*
Copyright (C) 2012 University of Texas at Austin
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <rsf.h>
int main(int argc, char* argv[])
{
int n1, is, ns, esize, pad;
off_t i2, n2;
char *trace, *zero;
sf_file in, shift;
sf_init(argc,argv);
in = sf_input("in");
shift = sf_output("out");
if (!sf_histint(in,"n1",&n1)) sf_error("No n1= in input");
n2 = sf_leftsize(in,1);
if (!sf_histint(in,"esize",&esize)) {
esize=sf_esize(in);
} else if (0>=esize) {
sf_error("cannot handle esize=%d",esize);
}
if (!sf_getint("ns",&ns)) sf_error("Need ns=");
/* number of shifts */
if (ns >= n1) sf_error("ns=%d is too large",ns);
sf_putint(shift,"n2",ns);
sf_shiftdim(in, shift, 2);
sf_fileflush(shift,in);
sf_setform(in,SF_NATIVE);
sf_setform(shift,SF_NATIVE);
n1 *= esize;
trace = sf_charalloc(n1);
zero = sf_charalloc(n1);
memset(zero,0,n1);
for (i2=0; i2 < n2; i2++) {
sf_charread(trace,n1,in);
for (is=1; is <= ns; is++) {
pad = is*esize;
sf_charwrite(zero,pad,shift);
sf_charwrite(trace,n1-pad,shift);
}
}
exit(0);
}