Add vector operations to utilities

[grits] / src / grits-util.h

diff --git a/src/grits-util.h b/src/grits-util.h
index 07715415f1ee89b0bd4e2654064e7658f193d44e..3c331f06b07708532b2dbb76deb1e6429a1e2bf5 100644 (file)
--- a/src/grits-util.h
+++ b/src/grits-util.h
@@ -202,6 +202,14 @@ gdouble ll2m(gdouble lon_dist, gdouble lat);
 
 gdouble distd(gdouble *a, gdouble *b);
 
+void crossd(gdouble *a, gdouble *b, gdouble *out);
+
+void crossd3(gdouble *a, gdouble *b, gdouble *c, gdouble *out);
+
+gdouble lengthd(gdouble *a);
+
+void normd(gdouble *a);
+
 gdouble lon_avg(gdouble a, gdouble b);
 
 #endif