diff options
| -rw-r--r-- | src/lib/ndpi_analyze.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/src/lib/ndpi_analyze.c b/src/lib/ndpi_analyze.c index 77400afd3..e142f914c 100644 --- a/src/lib/ndpi_analyze.c +++ b/src/lib/ndpi_analyze.c @@ -140,7 +140,8 @@ u_int32_t ndpi_data_max(struct ndpi_analyze_struct *s) { return(s->max_val); } /* Compute the variance on all values */ float ndpi_data_variance(struct ndpi_analyze_struct *s) { - return(s->num_data_entries ? ((float)s->stddev.sum_square_total - ((float)s->sum_total * (float)s->sum_total / (float)s->num_data_entries)) / (float)s->num_data_entries : 0.0); + float v = s->num_data_entries ? ((float)s->stddev.sum_square_total - ((float)s->sum_total * (float)s->sum_total / (float)s->num_data_entries)) / (float)s->num_data_entries : 0.0; + return((v < 0 /* rounding problem */) ? 0 : v); } /* ********************************************************************************* */ |