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.. py:function:: relative_humidity_from_dewpoint(t, td)
Computes the relative humidity from the given temperature (``t``) and dewpoint temperature (``td``).
:param t: temperature (K)
:type t: number, ndarray or :class:`Fieldset`
:param td: dewpoint temperature (K)
:type td: number, ndarray or :class:`Fieldset`
:rtype: same type as ``t`` or None
The result is the relative humidity in % units. On error None is returned. The computation is based on the following formula:
.. math::
r = 100 \frac {e_{wsat}(Td)}{e_{wsat}(T)}
where e w\ :sub:`sat` is the saturation vapour pressure over water (see :func:`saturation_vapour_pressure`).
When the result is a :class:`Fieldset` the ecCodes **paramId** in the output is set to 157 (=relative humidity).