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 | |
| 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
| -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 |