diff options
Diffstat (limited to 'src/lib/ndpi_analyze.c')
| -rw-r--r-- | src/lib/ndpi_analyze.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/src/lib/ndpi_analyze.c b/src/lib/ndpi_analyze.c index 06d461561..198aa4f9f 100644 --- a/src/lib/ndpi_analyze.c +++ b/src/lib/ndpi_analyze.c @@ -1729,6 +1729,9 @@ double ndpi_pearson_correlation(u_int32_t *values_a, u_int32_t *values_b, u_int1 variance_a = sum_squared_diff_a / (double)num_values, variance_b = sum_squared_diff_b / (double)num_values; covariance = sum_product_diff / (double)num_values; + if(variance_a == 0.0 || variance_b == 0.0) + return(0.0); + return(covariance / sqrt(variance_a * variance_b)); } |