1 files changed, 1 insertions, 1 deletions
diff --git a/diff.awk b/diff.awk
index d39b654..1d1f72d 100644
--- a/diff.awk
+++ b/diff.awk
@@ -55,7 +55,7 @@ NF {
             continue
         if ($y ~ number) {
             data[y] = $y
-            (data_prev[y] ~ number) ? diff[y] = data[y] - data_prev[y] : diff[y] = "nan"
+            diff[y] = data[y] - data_prev[y]
             data_prev[y] = data[y]
             printf(OFMT, diff[y])
         }