FIX: simplify Mercator transform

jklymak · jklymak · commit 2ca2865ae59f · 2019-01-16T09:06:52.000-08:00
diff --git a/examples/scales/scales.py b/examples/scales/scales.py
@@ -78,14 +78,7 @@ def inverse(x):
 # Function Mercator transform
 def forward(a):
     a = np.deg2rad(a)
-    # mask values too close to +/- 90, which are ill-defined.
-    masked = np.ma.masked_where((a <= -np.pi/2 + 0.02) |
-                                (a >= np.pi/2 - 0.02), a)
-    if masked.mask.any():
-        return np.rad2deg(
-                np.ma.log(np.abs(np.ma.tan(masked) + 1.0 / np.ma.cos(masked))))
-    else:
-        return np.rad2deg(np.log(np.abs(np.tan(a) + 1.0 / np.cos(a))))
+    return np.rad2deg(np.log(np.abs(np.tan(a) + 1.0 / np.cos(a))))
 
 
 def inverse(a):
