From 13d3239500c5af873935c81d079c928f4cdf0b1d Mon Sep 17 00:00:00 2001
From: Dustin Lang <dstndstn@gmail.com>
Date: Mon, 19 Mar 2018 17:01:14 -0400
Subject: [PATCH] oops, fix cdInverseAtPixel to ConstantFitsWcs

---
 tractor/wcs.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tractor/wcs.py b/tractor/wcs.py
index f0679aef..0545dbf2 100644
--- a/tractor/wcs.py
+++ b/tractor/wcs.py
@@ -155,7 +155,7 @@ def __init__(self, wcs):
         cd = self.wcs.get_cd()
         self.cd = np.array([[cd[0], cd[1]], [cd[2], cd[3]]])
 
-        self.cd_inverse = np.linalg.inv(cd)
+        self.cd_inverse = np.linalg.inv(self.cd)
         self.pixscale = self.wcs.pixel_scale()
 
     def hashkey(self):