diff options
| author | Eva Rachel Retuya <eraretuya@gmail.com> | 2017-03-20 19:27:05 +0800 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2017-03-25 16:47:13 +0000 |
| commit | cf6c77323a96fc40309cc8a4921ef206cccdd961 (patch) | |
| tree | 2cded1fce62a1f3975f28213dda3bd6a7997e536 /drivers | |
| parent | d7ed89d5aadf09f1060cd3a9cf07df17447c7392 (diff) | |
staging: iio: tsl2x7x_core: Fix standard deviation calculation
Standard deviation is calculated as the square root of the variance
where variance is the mean of sample_sum and length. Correct the
computation of statP->stddev in accordance to the proper calculation.
Fixes: 3c97c08b5735 ("staging: iio: add TAOS tsl2x7x driver")
Reported-by: Abhiram Balasubramanian <abhiram@cs.utah.edu>
Signed-off-by: Eva Rachel Retuya <eraretuya@gmail.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/iio/light/tsl2x7x_core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/staging/iio/light/tsl2x7x_core.c b/drivers/staging/iio/light/tsl2x7x_core.c index ea15bc1c300c..197201a70d59 100644 --- a/drivers/staging/iio/light/tsl2x7x_core.c +++ b/drivers/staging/iio/light/tsl2x7x_core.c @@ -854,7 +854,7 @@ void tsl2x7x_prox_calculate(int *data, int length, tmp = data[i] - statP->mean; sample_sum += tmp * tmp; } - statP->stddev = int_sqrt((long)sample_sum) / length; + statP->stddev = int_sqrt((long)sample_sum / length); } /** |