Hello,

I use the 2D table function in Dymola to lookup a periodic function in one direction.
The documentation simply states
extrapolation = 3: Periodically repeat the table data (periodical function).
This does not mention the fact that it is assumed (by dymola) that the first and last rows of the table are identical (for example, if the tabulated function is a cosine in the u1 direction, the table should cover the values from 0 up to and including 2pi). When the table is periodically extrapolated, these rows will be overlapping.

This is a problem since it is just as justifiable to implement the phase of the cosine as an array [pi/10, 2pi/10, 3pi/10, ..., 19pi/10, 20pi/10], thus excluding the 0 at the start. This kind of table can simply be concatenated, without overlap.

It seems openmodelica behaves the same as dymola. I don't know how other programs implement this.
I think the documentation should make the distinction clear, since making wrong assumptions will lead to errors.

Best regards,
Paul van der Hulst