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tadd harmonic_mean function - granular - granular dynamics simulation |
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git clone git://src.adamsgaard.dk/granular |
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--- |
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commit 1530b4bb345ad9e65cdf43acda89c5b5ca48ded6 |
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parent f4eaf592d0d80b9eed6e31d89337a6b4eebcef40 |
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Author: Anders Damsgaard <[email protected]> |
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Date: Wed, 21 Apr 2021 13:54:33 +0200 |
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add harmonic_mean function |
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Diffstat: |
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M util.c | 9 +++++++++ |
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M util.h | 2 ++ |
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2 files changed, 11 insertions(+), 0 deletions(-) |
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--- |
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diff --git a/util.c b/util.c |
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t@@ -123,3 +123,12 @@ xreallocarray(void *m, size_t n, size_t s) |
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return nm; |
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} |
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+ |
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+double |
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+harmonic_mean(double a, double b) |
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+{ |
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+ if (a < 1e-16 || b < 1e-16) |
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+ return 0.0; |
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+ else |
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+ return 2.0 * a * b / (a + b); |
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+} |
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diff --git a/util.h b/util.h |
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t@@ -17,4 +17,6 @@ double random_value_powerlaw(double min, double max); |
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void * xreallocarray(void *m, size_t n, size_t s); |
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+double harmonic_mean(double a, double b); |
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+ |
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#endif |
