# datatable.math.isclose()¶

isclose
(
, ,
*
,
rtol=1e-5
,
atol=1e-8
)

Compare two numbers x and y, and return True if they are close within the requested relative/absolute tolerance. This function only returns True/False, never NA.

More specifically, isclose(x, y) is True if either of the following are true:

• x == y (including the case when x and y are NAs),

• abs(x - y) <= atol + rtol * abs(y) and neither x nor y are NA

The tolerance parameters rtol, atol must be positive floats, and cannot be expressions.