Update static docs

1 files changed, 20 insertions, 0 deletions

diff --git a/docs/reference/get_vertex.md b/docs/reference/get_vertex.md
new file mode 100644
index 0000000..5f2b18b
--- /dev/null
+++ b/docs/reference/get_vertex.md
@@ -0,0 +1,20 @@
+# Fit a parabola through three points
+
+This was inspired by an answer on stackoverflow
+https://stackoverflow.com/a/717791
+
+## Usage
+
+``` r
+get_vertex(x, y)
+```
+
+## Arguments
+
+- x:
+
+  Three x coordinates
+
+- y:
+
+  Three y coordinates