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Mhalfint.c
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Mhalfint.c
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/* Half-order integration or differentiation.
December 2012 program of the month:
http://ahay.org/blog/2012/12/23/program-of-the-month-sfhalfint/
*/
/*
Copyright (C) 2004 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[])
{
bool adj, inv;
int nn,n1,n2,i1,i2;
float rho, *pp=NULL;
sf_file in=NULL, out=NULL;
sf_init(argc,argv);
in = sf_input("in");
out = sf_output("out");
if (!sf_histint(in,"n1",&n1)) sf_error("No n1= in input");
n2 = sf_leftsize(in,1);
if (!sf_getbool("adj",&adj)) adj=false;
/* If y, apply adjoint */
if (!sf_getbool("inv",&inv)) inv=false;
/* If y, do differentiation instead of integration */
if (!sf_getfloat("rho",&rho)) rho = 1.-1./n1;
/* Leaky integration constant */
if (inv) {
sf_warning("%s half-order differentiation",adj? "anticausal":"causal");
} else {
sf_warning("%s half-order integration",adj? "anticausal":"causal");
}
nn = 2*kiss_fft_next_fast_size((n1+1)/2);
pp = sf_floatalloc(nn);
sf_halfint_init (inv, nn, rho);
for (i2=0; i2 < n2; i2++) {
sf_floatread (pp,n1,in);
for (i1=n1; i1 < nn; i1++) {
pp[i1]=0.;
}
sf_halfint (adj, pp);
sf_floatwrite (pp,n1,out);
}
exit(0);
}