If I interpolate a list
f=ListInterpolation[{1,2,3,4,5,6,7}]
the result is in the domain {{1,7}}, so something like f[8] will be out of scope.
How can I shift the domain, say from 1,7 to 8,15?
$\begingroup$
$\endgroup$
Add a comment
|
1 Answer
$\begingroup$
$\endgroup$
3
One thing you can do is to shift the function:
f = ListInterpolation[{1, 2, 3, 4, 5, 6, 7}]
g[x_] := f[x - 7];
Now g is a shifted version of f having the domain starting at 8.
-
$\begingroup$ Or to get a periodic function:
g[x_] := Mod[x, 7] /. (0 -> 7)$\endgroup$ Jul 4, 2018 at 14:35 -
$\begingroup$ @BobHanlon If one is aiming for periodicity, there is the
PeriodicInterpolationoption $\endgroup$ Jul 4, 2018 at 15:14 -
$\begingroup$ @LukasLang - if you try that option you will encounter the error
ListInterpolation::per : In dimension 1 the data at the endpoints of the fundamental period are not equal.$\endgroup$ Jul 4, 2018 at 15:17