Stop writing nan for ovl-cov-stats

Bump micro version

falconc.nimble

@@ -1,6 +1,6 @@
 # Package
 
-version       = "1.13.0"
+version       = "1.13.1"
 author        = "Zev Kronenberg"
 author        = "Christopher Dunn"
 description   = "C Utilities for bioinformatics"

src/falconcpkg/ovl_cov_stats.nim

@@ -44,6 +44,12 @@ proc collect_from_fofn*(in_fn_list: seq[string]): seq[int] =
         allCounts.add(counts)
     return allCounts
 
+proc standardDeviation(s: RunningStat): float =
+    if s.n == 0:
+        return 0.0
+    else:
+        return stats.standardDeviation(s)
+
 proc calc_stats*(counts: seq[int]): tuple[mean, stddev, median: float, min, max, n: int] =
     var rs: RunningStat
     rs.push(counts)

tests/t_ovl_cov_stats.nim

@@ -34,7 +34,7 @@ suite "ovl_cov_stats calc_stats":
     test "empty input":
         let data: seq[int] = @[]
         let results = ovl_cov_stats.calc_stats(data)
-        let expected = (mean: float(0.0), stddev: float(NaN), median: float(0.0), min: 0, max: 0, n: 0)
+        let expected = (mean: float(0.0), stddev: float(0.0), median: float(0.0), min: 0, max: 0, n: 0)
         # If this is not converted to string, tuple comparison fails for some reason.
         check $results == $expected
 
@@ -48,14 +48,14 @@ suite "ovl_cov_stats calc_stats":
 suite "ovl_cov_stats collect_from_stream":
     # This implicitly tests the count_overlaps proc.
 
-    test "empty input":
+    test "empty stream":
         let inStr = ""
         let inStream: Stream = newStringStream(inStr)
         let results = ovl_cov_stats.collect_from_stream(inStream)
         let expected: seq[int] = @[]
         check results == expected
 
-    test "empty input":
+    test "test data 1":
         let inStr = testDataCollectFromStream1
         let inStream: Stream = newStringStream(inStr)
         let results = ovl_cov_stats.collect_from_stream(inStream)