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#ifndef __INTERPOLATE_H__
#define __INTERPOLATE_H__
__device__ float
interp(float x, int n, float *xp, float *fp)
{
int lower = 0;
int upper = n-1;
if (x <= xp[lower])
return fp[lower];
if (x >= xp[upper])
return fp[upper];
while (lower < upper-1)
{
int half = (lower+upper)/2;
if (x < xp[half])
upper = half;
else
lower = half;
}
float df = fp[upper] - fp[lower];
float dx = xp[upper] - xp[lower];
return fp[lower] + df*(x-xp[lower])/dx;
}
__device__ float
interp_uniform(float x, int n, float x0, float dx, float *fp)
{
if (x <= x0)
return x0;
float xmax = x0 + dx*(n-1);
if (x >= xmax)
return xmax;
int lower = (x - x0)/dx;
int upper = lower + 1;
float df = fp[upper] - fp[lower];
return fp[lower] + df*(x-(x0+dx*lower))/dx;
}
#endif
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