779af7e1ca5a2971bdc6d7c458b6190147edb465
kent
  Mon Aug 25 08:06:05 2014 -0700
Oops forgot to add this.
diff --git src/inc/pairDistance.h src/inc/pairDistance.h
new file mode 100644
index 0000000..4dc9280
--- /dev/null
+++ src/inc/pairDistance.h
@@ -0,0 +1,31 @@
+/* pairDistance - help manage systems where you have a list of distances between pairs of
+ * elements */
+
+#ifndef PAIRDISTANCE_H
+#define PAIRDISTANCE_H
+
+struct pairDistance
+/* A pair of items and the distance between them. */
+    {
+    struct pairDistance *next;
+    char *a;	/* First in pair */
+    char *b;	/* Second in pair */
+    double distance;  /* Distance between two */
+    };
+
+struct pairDistance *pairDistanceReadAll(char *fileName);
+/* Read in file of format <a> <b> <distance> into list of pairs */
+
+struct hash *pairDistanceHashList(struct pairDistance *pairList);
+/* Return hash of all pairs keyed by pairName function on pair with pair values */
+
+double pairDistanceHashLookup(struct hash *pairHash, char *aName, char *bName);
+/* Return distance between a and b. */
+
+void pairDistanceInvert(struct pairDistance *list);
+/* Go through and reverse distances, and make them positive. */
+
+char *pairDistanceName(char *a, char *b, char *outBuf, int outBufSize);
+/* Return name for pair */
+
+#endif /* PAIRDISTANCE_H */