From 05c10f940f9df3a5b24e2a0b476052fbe5a22282 Mon Sep 17 00:00:00 2001 From: Damien Lespiau Date: Thu, 25 Jun 2015 23:57:49 +0100 Subject: stats: Use an algorithm popularised by Knuth to compute mean and variance Suggested-by: Chris Wilson Signed-off-by: Damien Lespiau --- lib/igt_stats.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'lib/igt_stats.h') diff --git a/lib/igt_stats.h b/lib/igt_stats.h index a46b399c..acb86a6b 100644 --- a/lib/igt_stats.h +++ b/lib/igt_stats.h @@ -28,9 +28,12 @@ typedef struct { uint64_t *values; unsigned int capacity; unsigned int n_values; + unsigned int mean_variance_valid : 1; + double mean, variance; } igt_stats_t; void igt_stats_init(igt_stats_t *stats, unsigned int capacity); void igt_stats_fini(igt_stats_t *stats); void igt_stats_push(igt_stats_t *stats, uint64_t value); double igt_stats_get_mean(igt_stats_t *stats); +double igt_stats_get_variance(igt_stats_t *stats); -- cgit v1.2.3