Removed address operator not needed for function pointer
Need to recompute influence maps after changing smoothing parameter
Changed from blkflg to influence flag array
Additional tweaks -- now 11 times faster than original version
Doubled calculation speed and exposed raw weight computation
Minor improvement
Removed stray semicolon in interp2_realloc
Really minor tweaks
Significant speed improvement
Added accessor functions for minimum spacing and smoothing parameters
Changed radius specification to diameter and added usage comment
Fixed a number of serious bugs in initial implementation
Added interp2_realloc() call, exposed interp2_analyze() and code improvements
Created routines for interpolating anisotropic 2-D samples
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