faraphel/chrony
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

manual: handle failed robust regression

Browse source
This commit is contained in:
Miroslav Lichvar 2017-07-25 09:31:04 +02:00
parent 0c54cf316d
commit 6ec3dc1650
1 changed files with 13 additions and 19 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

20
manual.c
View file

@ -108,32 +108,26 @@ estimate_and_set_system(struct timespec *now, int offset_provided, double offset
int found_freq;
double slew_by;
b0 = offset_provided ? offset : 0.0;
b1 = freq = 0.0;
found_freq = 0;
if (n_samples > 1) {
for (i=0; i<n_samples; i++) {
agos[i] = UTI_DiffTimespecsToDouble(&samples[n_samples - 1].when, &samples[i].when);
offsets[i] = samples[i].offset;
}
RGR_FindBestRobustRegression(agos, offsets, n_samples,
1.0e-8, /* 0.01ppm easily good enough for this! */
&b0, &b1, &n_runs, &best_start);
if (RGR_FindBestRobustRegression(agos, offsets, n_samples, 1.0e-8,
&b0, &b1, &n_runs, &best_start)) {
/* Ignore b0 from regression; treat offset as being the most
recently entered value. (If the administrator knows he's put
an outlier in, he will rerun the settime operation.) However,
the frequency estimate comes from the regression. */
freq = -b1;
found_freq = 1;
} else {
if (offset_provided) {
b0 = offset;
} else {
b0 = 0.0;
}
b1 = freq = 0.0;
found_freq = 0;
} else {
agos[0] = 0.0;
offsets[0] = b0;
}