/usr/include/boinc/average.h is in libboinc-app-dev 7.9.3+dfsg-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 | // This file is part of BOINC.
// http://boinc.berkeley.edu
// Copyright (C) 2010 University of California
//
// BOINC is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// BOINC is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with BOINC. If not, see <http://www.gnu.org/licenses/>.
// structure for tracking the recent average
// of a distribution that may change over time
//
struct AVERAGE {
double n; // double to avoid integer overflow
double avg;
inline void clear() {
n = avg = 0;
}
// return true if sample exceeded limit and was truncated
//
inline bool update(
double sample,
double n_threshold,
// after this many samples, use exponential average
double sample_weight,
// new samples get this weight in exp avg
double sample_limit
// truncate samples at avg*limit
) {
double delta;
bool truncated = false;
if (sample < 0) return true;
if (n && avg) {
if (sample > avg*sample_limit) {
sample = avg*sample_limit;
truncated = true;
}
}
n++;
delta = sample - avg;
if (n < n_threshold) {
avg += delta/n;
} else {
avg += sample_weight*delta;
}
return truncated;
}
inline double get_avg() {
return avg;
}
};
// same, but variance also
//
struct AVERAGE_VAR : AVERAGE {
double var;
double q;
inline bool update_var(
double sample,
double n_threshold,
// after this many samples, use exponential average
double sample_weight,
// new samples get this weight in exp avg
double sample_limit
// truncate samples at avg*limit
) {
double delta;
bool truncated = false;
if (sample < 0) return true;
if (n && avg) {
if (sample > avg*sample_limit) {
sample = avg*sample_limit;
truncated = true;
}
}
n++;
delta = sample - avg;
if (n < n_threshold) {
avg += delta/n;
q += delta*(sample - avg);
var = q/n;
} else {
avg += sample_weight*delta;
double vdelta = (delta*delta - var);
var += sample_weight*vdelta;
}
return truncated;
}
inline double get_var() {
return var;
}
inline void clear() {
AVERAGE::clear();
var = 0;
q = 0;
}
};
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