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/*
IDRandom
Denis Pollney <pollney@aei.mpg.de>
14 February 2002
Put random data into the evolution variables for robust stability
testing a-la-winicour.
$Header$
*/
#include <stdlib.h>
#include "noise.h"
#include "cctk_Arguments.h"
#include "cctk_Parameters.h"
void
add_noise_to_group (int idx, const char* optstring, void* cctkGH)
{
int i, j, k, ijk;
CCTK_REAL* data;
CCTK_REAL amplitude;
CCTK_REAL offset;
cGH* GH = cctkGH;
int type;
data = (CCTK_REAL*) CCTK_VarDataPtrI(GH, 0, idx);
amplitude = *((CCTK_REAL*) CCTK_ParameterGet("amplitude", "Noise", &type))
/ RAND_MAX;
offset = 0.5 * amplitude;
for (k=1; k< GH->cctk_lsh[2]-1; ++k)
{
for (j=1; j< GH->cctk_lsh[1]-1; ++j)
{
for (i=1; i< GH->cctk_lsh[0]-1; ++i)
{
ijk = CCTK_GFINDEX3D(GH, i, j, k);
data[ijk] += RAND_VAL;
}
}
}
}
void
id_noise(CCTK_ARGUMENTS)
{
DECLARE_CCTK_ARGUMENTS
DECLARE_CCTK_PARAMETERS
if (CCTK_TraverseString(id_vars, add_noise_to_group, cctkGH,
CCTK_GROUP_OR_VAR) < 0)
{
CCTK_WARN (1, "Failed to parse 'IDRandom::noisy_id_vars' parameter");
}
}
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