* arith.c (atang2): New function.

* eval.c (eval_init): Register as atang2 as a atan2 intrinsic.

* lib.h (atang2): Declared.

* txr.1: Documented atan2.

1 files changed, 6 insertions, 0 deletions

diff --git a/arith.c b/arith.c
index e4972209..09828f59 100644
--- a/arith.c
+++ b/arith.c
@@ -1431,6 +1431,12 @@ val atang(val num)
   return flo(atan(c_flo(to_float(lit("atan"), num))));
 }
 
+val atang2(val y, val x)
+{
+  return flo(atan2(c_flo(to_float(lit("atan2"), y)),
+                   c_flo(to_float(lit("atan2"), x))));
+}
+
 val loga(val num)
 {
   return flo(log(c_flo(to_float(lit("log"), num))));