# Constants of the cf module¶

cf.masked

The cf.masked constant allows data array values to be masked by direct assignment. This is consistent with the behaviour of numpy masked arrays.

For example, masking every element of a field’s data array could be done as follows:

>>> f[...] = cf.masked


To mask every element of a field’s data array whose value is less than zero:

>>> f.where(cf.lt(0), cf.masked, i=True)