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Mrmtrace.c
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Mrmtrace.c
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/* Remove part of traces (resample) in order to make aliasing */
/*
Copyright (C) 2013 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 <math.h>
#include <rsf.h>
int main(int argc, char* argv[])
{
int i1, i2, n1, n2, n22, factor;
float **dd, **ddout, d1, o1, d2, o2, d22, o22;
sf_file in, out;
sf_init(argc,argv);
in = sf_input("in");
out = sf_output("out");
if (!sf_histint(in,"n1",&n1)) sf_error("No n1= in input!");
if (!sf_histfloat(in,"d1",&d1)) sf_error("No d1= in input!");
if (!sf_histfloat(in,"o1",&o1)) o1=0;
if (!sf_histint(in,"n2",&n2)) sf_error("No n2= in input!");
if (!sf_histfloat(in,"d2",&d2)) sf_error("No d2= in input!");
if (!sf_histfloat(in,"o2",&o2)) o2=0;
if (!sf_getint("factor",&factor)) factor=2;
/* zero part beginning point */
dd=sf_floatalloc2(n1, n2);
n22=n2/factor;
ddout=sf_floatalloc2(n1,n22);
d22=d2*factor;
o22=o2+d2*(factor-1);
sf_floatread(dd[0],n1*n2,in);
sf_putint(out,"n2",n22);
sf_putfloat(out,"d2",d22);
sf_putfloat(out,"o2",o22);
for(i2=0;i2<n22;i2++)
for(i1=0;i1<n1;i1++)
ddout[i2][i1]=dd[(i2+1)*factor-1][i1];
sf_floatwrite(ddout[0],n1*n22,out);
exit(0);
}