# cf.DomainAncillary.cos¶

DomainAncillary.cos(bounds=True, inplace=False, i=False)[source]

Take the trigonometric cosine of the data, element-wise.

Units are accounted for in the calculation, so that the the cosine of 90 degrees_east is 0.0, as is the cosine of 1.57079632 radians. If the units are not equivalent to radians (such as Kelvin) then they are treated as if they were radians.

The output units are ‘1’ (nondimensionsal).

Parameters: bounds: bool, optional If False then do not alter any bounds. By default any bounds are also altered. inplace: bool, optional If True then do the operation in-place and return None. i: deprecated at version 3.0.0 Use inplace parameter instead. The construct with the cosine of data values. If the operation was in-place then None is returned.

Examples:

>>> f.Units
<Units: degrees_east>
>>> print(f.array)
[[-90 0 90 --]]
>>> f.cos()
>>> f.Units
<Units: 1>
>>> print(f.array)
[[0.0 1.0 0.0 --]]

>>> f.Units
<Units: m s-1>
>>> print(f.array)
[[1 2 3 --]]
>>> f.cos()
>>> f.Units
<Units: 1>
>>> print(f.array)
[[0.540302305868 -0.416146836547 -0.9899924966 --]]