# SimPEG.maps.ExpMap.inverse#

ExpMap.inverse(D)[source]#

Apply the inverse of the exponential mapping to an array.

For the exponential mapping $$\mathbf{u}(\mathbf{m})$$, the inverse mapping on a variable $$\mathbf{x}$$ is performed by taking the natural logarithms of elements, i.e.:

$\mathbf{m} = \mathbf{u}^{-1}(\mathbf{x}) = log(\mathbf{x})$
Parameters
Dnumpy.ndarray

A set of input values

Returns
numpy.ndarray

A numpy.ndarray containing result of applying the inverse mapping to the elements in D; which in this case is the natural logarithm.