Bug InterpBilinear.sm (24 KiB) downloaded 58 time(s).

As I've stated in the other thread, there isn't a check on 4th and 5th arguments, that should be scalars.

The implementation is a 1:1 port of a code that was discussed here on the forum some time ago, not based on built-in linterp; here there is your example with the InterpBilinear function exposed in worksheet code (intBil).

InterpBilinear_debug.sm (21 KiB) downloaded 71 time(s).

Seems that a vector argument can fool my binary search function, that doesn't stop the wrong input and ends calculating wrong results.

P.S: I'll fix the plugin as soon as I can