var_a

var_a(fs[, area])

Computes the area weighted variance for each field in fs.

Parameters

• fs (Fieldset) – input fieldset

• area (list) – area as [N,W,S,E] to perform the computations

Return type

number or list

If the area is not specified the whole field will be used in the calculation. The result is a number for a single field or a list for a multi-field Fieldset.

Note

The computations are implemented via integrate() and the following lines are equivalent:

y = mv.var_a(x)
y = mv.integrate(x*x) - mv.integrate(x)**2

Note

See also integrate(), var(), rms_a() and stdev_a().