re used and are distinguished only by their appearance after internal functions when the user issues a SHOW FUNC command.</p>
<p align="left">A Ferret external function uses input arguments defined in a Ferret session and computes a result with user-supplied Fortran or C code. The external function specifies how the grid for the result will be generated. The axes can be inherited from the input arguments or specified in the external function code.</p>
<p align="left">Utility functions, linked in when the ex