Displaying 3 results from an estimated 3 matches for "epsrel".
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epel
2004 Nov 18
0
Calling Rdqags doesn't produce correct result.
...llowing attempt?
I am trying to call the R built-in function Rdqags()
from my C
program for numerical integration. Following are the C
program
and the corresponding R program:
C program
---------
void test(double *a,
double *b,
double *epsabs,
double *epsrel,
double *result,
double *abserr,
int *neval,
int *ier,
int *limit,
int *lenw,
int *last,
int *iwork,
double *work,
double *exx)
{
void *ex;...
2005 May 09
2
use "integrate" for functions defined in C, not R
...return;
}
3. Similar to "call_dqags", I define a C function "my_call_dqags" that
has it's own parameters of "lower, upper" and etc define in C, instead of
parsing from R. And I call
Rdqags(Cintfn,
&lower, &upper, &epsabs, &epsrel, &result,
&abserr, &neval, &ier, &limit, &lenw, &last, iwork, work);
instead of
Rdqags(Rintfn, (void*)&is,
&lower, &upper, &epsabs, &epsrel, &result,
&abserr, &neval, &ier, &limit, &lenw, &...
2001 Jul 12
1
more subroutines for integrate()
...utine calculates an approximation result to a given
c definite integral
c i = integral of f(x)*w(x) over (a,b)
c where w(x) = cos(omega*x) or w(x) = sin(omega*x),
c hopefully satisfying following claim for accuracy
c abs(i-result).le.max(epsabs,epsrel*abs(i)).
This is useful for numeric (inverse) Fourier transforms. Is there any
hope?
cheers...
Brandon
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