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[math] adding mean, variance and standard deviation to generic vector functions

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Al
2017-04-02 23:29:15 -04:00
parent 3cb513a8f2
commit 3aab15a0a0
1 changed files with 20 additions and 0 deletions
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20
src/vector_math.h
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@@ -210,6 +210,26 @@
return result; \ return result; \
} \ } \
\ \
static inline double name##_mean(type *array, size_t n) { \
unsigned_type sum = name##_sum(array, n); \
return (double)sum / n; \
} \
\
static inline double name##_var(type *array, size_t n) { \
double mu = name##_mean(array, n); \
double sigma2 = 0.0; \
for (size_t i = 0; i < n; i++) { \
double dev = (double)array[i] - mu; \
sigma2 += dev * dev; \
} \
return sigma2 / n; \
} \
\
static inline double name##_std(type *array, size_t n) { \
double sigma2 = name##_var(array, n); \
return sqrt(sigma2); \
} \
\
static inline type name##_product(type *array, size_t n) { \ static inline type name##_product(type *array, size_t n) { \
type result = 0; \ type result = 0; \
for (size_t i = 0; i < n; i++) { \ for (size_t i = 0; i < n; i++) { \