Issue #1459 fix interp function when data is shared amongst multiple parameters.

Former-commit-id: f04c6b7e1e [formerly 9c8281cd26029e9b3979fbc8f0ed713b66f092ba]
Former-commit-id: c0e9f3429b

cave/com.raytheon.uf.viz.derivparam.python/localization/derivedParameters/functions/Interp.py

@@ -18,7 +18,7 @@
 # further licensing information.
 ##
 from scipy.interpolate import Rbf
-from numpy import zeros, float32, NaN, isnan
+from numpy import zeros, float32, NaN, isnan, array
 
 ##
 # Designed to replace interp_up and interp_down in design files for point data
@@ -31,6 +31,9 @@ def execute(paramArray, vertArray, numLevels, vertPoints, maxGap=None):
         if type(verts) == float32:
             verts = [verts]
         params = paramArray[i]
+        # clone verts and params before modifying
+        verts = array(verts)
+        params = array(params)
         gi = 0
         for ci in range(len(verts)):
             if isnan(verts[ci]) or isnan(params[ci]):