cf.Field.cos

Field.cos(i=False)[source]

Take the trigonometric cosine of the data array.

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).

See also

sin, tan

Examples 1: 
>>> g = f.cos()
Parameters:
i: bool, optional

If True then update the field in place. By default a new field is created. In either case, a field is returned.
Returns:
out: cf.Field

The field with the cosine of data array values.
Examples 2: 
>>> f.Units
<CF Units: degrees_east>
>>> print f.array
[[-90 0 90 --]]
>>> f.cos()
>>> f.Units
<CF Units: 1>
>>> print f.array
[[0.0 1.0 0.0 --]]

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