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3a5cf84317
This changes how we compute the variance. We want an unbiased variance when reasoning about a sample. Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>
122 lines
3.0 KiB
C
122 lines
3.0 KiB
C
/*
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* Copyright © 2015 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*
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*/
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#include "igt_core.h"
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#include "igt_stats.h"
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/* Make sure we zero igt_stats_t fields at init() time */
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static void test_init_zero(void)
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{
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igt_stats_t stats;
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stats.mean = 1.;
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igt_stats_init(&stats, 2);
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igt_assert(stats.mean == 0.);
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}
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static void test_mean(void)
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{
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igt_stats_t stats;
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double mean;
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igt_stats_init(&stats, 5);
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igt_stats_push(&stats, 2);
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igt_stats_push(&stats, 4);
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igt_stats_push(&stats, 6);
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igt_stats_push(&stats, 8);
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igt_stats_push(&stats, 10);
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mean = igt_stats_get_mean(&stats);
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igt_assert(mean == (2 + 4 + 6 + 8 + 10) / 5.);
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igt_stats_fini(&stats);
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}
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static void test_invalidate_mean(void)
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{
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igt_stats_t stats;
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double mean1, mean2;
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igt_stats_init(&stats, 6);
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igt_stats_push(&stats, 2);
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igt_stats_push(&stats, 4);
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igt_stats_push(&stats, 6);
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igt_stats_push(&stats, 8);
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igt_stats_push(&stats, 10);
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mean1 = igt_stats_get_mean(&stats);
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igt_assert(mean1 == (2 + 4 + 6 + 8 + 10) / 5.);
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igt_stats_push(&stats, 100);
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mean2 = igt_stats_get_mean(&stats);
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igt_assert(mean1 != mean2);
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igt_stats_fini(&stats);
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}
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/*
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* Taken from the "Basic examples" section of:
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* https://en.wikipedia.org/wiki/Standard_deviation
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*/
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static void test_std_deviation(void)
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{
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igt_stats_t stats;
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double mean, variance, std_deviation;
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igt_stats_init(&stats, 8);
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igt_stats_set_population(&stats, true);
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igt_stats_push(&stats, 2);
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igt_stats_push(&stats, 4);
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igt_stats_push(&stats, 4);
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igt_stats_push(&stats, 4);
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igt_stats_push(&stats, 5);
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igt_stats_push(&stats, 5);
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igt_stats_push(&stats, 7);
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igt_stats_push(&stats, 9);
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mean = igt_stats_get_mean(&stats);
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igt_assert(mean == (2 + 3 * 4 + 2 * 5 + 7 + 9) / 8.);
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variance = igt_stats_get_variance(&stats);
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igt_assert(variance == 4);
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std_deviation = igt_stats_get_std_deviation(&stats);
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igt_assert(std_deviation == 2);
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igt_stats_fini(&stats);
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}
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igt_simple_main
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{
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test_init_zero();
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test_mean();
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test_invalidate_mean();
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test_std_deviation();
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}
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