diff options
| -rw-r--r-- | 2d/vector.scm | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/2d/vector.scm b/2d/vector.scm index 7dcbcb2..bd14dd5 100644 --- a/2d/vector.scm +++ b/2d/vector.scm @@ -31,7 +31,8 @@ scale mag normalize - vector-reduce)) + vector-reduce + vector-from-polar)) (define (vx vector) "Returns the first element of a vector." @@ -79,3 +80,7 @@ (if (= (vector-length vector) i) prev (loop (1+ i) (proc prev (vector-ref vector i)))))))) + +(define (vector-from-polar r theta) + (vector (* r (cos theta)) + (* r (sin theta)))) |