Making a look-up table periodic

Good morning everyone!

I have the following look-up table.

Basically, this table contains a sample that goes from -180 to 180deg and i would like this sample to be repeated with a period of 2*pi. (To be more clear, the input of the table goes from from -inf to +inf but the table manages only -180 to 180deg).

Is it possible?

Answer 1

[Chunru]

theta = (-180:180);
x = randn(size(theta));
% Look up table/interpolant
F = griddedInterpolant(theta, x);

% wrap the input to +/-180
y = F(25)

y = -1.1305

y = F(wrapTo180(746))

y = -0.2496

[MARCO LORENZI]

Thank you for the help, but i cannot use the wrap function since to make the model work i just had to unwrap the input (it was going -180 to 180 and i also needed that to run from -inf to +inf

[Chunru]

The input to "wrapTo180" is from -inf to inf.

[MARCO LORENZI]

As you can see here i needed to unwrap my alpha (the left blockset) to erase a discontinuity. In doing this alpha goes from -inf to +inf with no issues. The only issue goes with the tables cause i have values of the table output only for the -180 180 interval.

[Chunru]

You just neet to insert a matlab function block and using the wrapTo180 function.

[MARCO LORENZI]

Thank you very much for the help!