[docs]
def lev2knots_lin(I):
"""
Relation between level and number of points for linear level-to-knots mapping.
This function maps a given level `I` to the number of points `m` by simply
returning the same integer (i.e., `m = I`). It is intended for use in
constructing sparse grids where a linear level-to-knots mapping is needed.
Parameters
----------
I : int or array-like
Level(s) for which to compute the number of knots.
Returns
-------
m : int or array-like
Number of points to be used in each direction.
Notes
-----
The relationship between level and number of points is given by:
m = I
"""
m = I
return m