Xcos, "interpolation" block

[Jerzy Karczmarczuk]

There is a palette called "interpolation" (which apparently has a different
name: "lookup tables"... Inside there is a block "explained" in such a way:

The output of this block is a function of the input obtained by linear
interpolation. This block has a single scalar input and a single scalar
output port. The coord. and coord. give respectively the coordinate and the
coordinate of the data points to be interpolated. coord must be strictly
increasing.

==

Could anybody explain WHAT does this interpolate?
A simple example perhaps?

Thanks.
JK


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