diff options
| author | Jan Schmidt <jan@centricular.com> | 2015-02-05 22:55:39 +1100 |
|---|---|---|
| committer | Jan Schmidt <jan@centricular.com> | 2015-02-07 04:38:39 +1100 |
| commit | 9d2b2768e35f59851b8f8d3dfac029a1469de34e (patch) | |
| tree | 6cd7ace374171a7cb243226610e3f9e30654375b /gst | |
| parent | 08167e3234a3fb277bccb2de6370ff14e218616d (diff) | |
clock: Make linear regression x/y base start from maximum observation.
Project the results of the linear regression to the end of the
regression range, so they're more directly comparable to results
going forward
Diffstat (limited to 'gst')
| -rw-r--r-- | gst/gstclock-linreg.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/gst/gstclock-linreg.c b/gst/gstclock-linreg.c index 2164a9f0b..874917fef 100644 --- a/gst/gstclock-linreg.c +++ b/gst/gstclock-linreg.c @@ -217,8 +217,11 @@ _priv_gst_do_linear_regression (GstClockTime * times, guint n, *m_num = sxy; *m_denom = sxx; - *xbase = xmin; - *b = (ybar + ymin) - gst_util_uint64_scale (xbar, *m_num, *m_denom); + *b = (ymin + ybar) - gst_util_uint64_scale (xbar, *m_num, *m_denom); + /* Report base starting from the most recent observation */ + *xbase = xmax; + *b += gst_util_uint64_scale (xmax - xmin, *m_num, *m_denom); + *r_squared = ((double) sxy * (double) sxy) / ((double) sxx * (double) syy); #ifdef DEBUGGING_ENABLED |