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use double precision for large summations, #4408

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heckflosse
2018-02-21 14:28:54 +01:00
parent fc751a0cce
commit e69952d654
5 changed files with 13 additions and 14 deletions
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7
rtengine/EdgePreservingDecomposition.cc
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@@ -42,7 +42,8 @@ float *SparseConjugateGradient(void Ax(float *Product, float *x, void *Pass), fl
}
//s is preconditionment of r. Without, direct to r.
float *s = r, rs = 0.0f;
float *s = r;
double rs = 0.0; // use double precision for large summations
if(Preconditioner != nullptr) {
s = new float[n];
@@ -77,7 +78,7 @@ float *SparseConjugateGradient(void Ax(float *Product, float *x, void *Pass), fl
for(iterate = 0; iterate < MaximumIterates; iterate++) {
//Get step size alpha, store ax while at it.
float ab = 0.0f;
double ab = 0.0; // use double precision for large summations
Ax(ax, d, Pass);
#ifdef _OPENMP
#pragma omp parallel for reduction(+:ab)
@@ -94,7 +95,7 @@ float *SparseConjugateGradient(void Ax(float *Product, float *x, void *Pass), fl
ab = rs / ab;
//Update x and r with this step size.
float rms = 0.0;
double rms = 0.0; // use double precision for large summations
#ifdef _OPENMP
#pragma omp parallel for reduction(+:rms)
#endif