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Fixed td_quantile returning NaN when 1 sample #33

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Fixed td_quantile returning NaN when 1 sample #33

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4 changes: 2 additions & 2 deletions src/tdigest.c
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Original file line number Diff line number Diff line change
Expand Up @@ -412,11 +412,11 @@ static double td_internal_iterate_centroids_to_index(const td_histogram_t *h, co
double td_quantile(td_histogram_t *h, double q) {
td_compress(h);
// q should be in [0,1]
if (q < 0.0 || q > 1.0 || h->merged_nodes == 0) {
if (q < 0.0 || q > 1.0 || h->merged_nodes + h->unmerged_nodes == 0) {
return NAN;
}
// with one data point, all quantiles lead to Rome
if (h->merged_nodes == 1) {
if (h->merged_nodes + h->unmerged_nodes == 1) {
return h->nodes_mean[0];
}

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