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Optimization of Triangle Number Sum #64

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Optimization of Triangle Number Sum #64

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6 changes: 1 addition & 5 deletions src/core/fmm/utils.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -3,11 +3,7 @@
size_t TriangleNumbers(size_t n) { return (n * (n + 1)) / 2; }

size_t Nterms(size_t p) {
size_t result = 0;
for (auto i = 0; i < p + 2; i++) {
result += TriangleNumbers(i);
}
return result;
return ((p + 1) * (p + 2) * (p + 3)) / 6;
}

size_t Msize(size_t order, size_t source_order) {
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