Output the natural (base e) logarithm of the input (input > 0
required)
Block that outputs y = log(u), where u
is an input and log() is the natural logarithm
(base-e) function.
An error occurs if the input u is zero or
negative.

- March 2, 2020, by Michael Wetter:
Changed icon to display dynamically the output value.
- January 3, 2017, by Michael Wetter:
First implementation, based on the implementation of the Modelica
Standard Library.
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