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.. py:function:: dewpoint_from_relative_humidity(t, r)
Computes the dewpoint temperature from the given temperature (``t``) and relative humidity (``r``).
:param t: temperature (K)
:type t: number, ndarray or :class:`Fieldset`
:param r: relative humidity (%)
:type r: number, ndarray or :class:`Fieldset`
:rtype: same type as ``t`` or None
The result is the dewpoint temperature in K units. On error None is returned. The computation is based on the following formula:
.. math::
r = \frac{e_{wsat}(td)}{e_{wsat}(t)}
where
* e\ :sub:`wsat` is the saturation vapour pressure over water (see :func:`saturation_vapour_pressure`).
* td is the dewpoint temperature