Mapped field function

Format:

fdm("field name",argument1,argument2,argument3)

Use the mapped field (FDM) function to reference the functional relationship of a field in an expression. Unlike the field (FD) function, the FDM function can only reference fields that have a spatial independent domain. The FDM function returns the value of the field for the specified global Cartesian coordinates.

Unlike the FD function where the arguments after the field specification are optional, the FDM function requires arguments after the field specification. When the FDM function evaluates the field, it uses as the global X-coordinate the first argument. As the global Y-coordinate, it uses the second argument. As the global Z-coordinate, it uses the third argument. This is different from the FD function where:

• If the field is defined relative to the global coordinate system, the FD function interprets the values for the arguments as global coordinates of the same type as the field itself.For example, if the field is defined relative to the global cylindrical coordinate system, the FD function interprets the first argument as the global radial coordinate, the second argument as the global theta coordinate, and the third argument as the global axial coordinate.

• If the field is defined relative to a local coordinate system or a parametric map, the FD function interprets the values for the arguments as being the local coordinates or parametric coordinates, respectively.

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