ATAN, IR, IA, --, --, Name, --, --, FACTA
Forms the arctangent of a complex variable.
IRArbitrary reference number assigned to the resulting variable
(2 to NV [NUMVAR]). If this
number is the same as for a previously defined variable, the previously defined
variable will be overwritten with this result.
IAReference number of the complex variable to be operated on.
--, --Unused fields.
NameThirty-two character name for identifying the variable on the printout and displays. Embedded blanks are compressed upon output.
--, --Unused fields.
FACTAScaling factor (positive or negative) applied to variable IA (defaults
to 1.0). Usually FACTA should be set to 1. FACTA may
affect the position of the angle by a multiple of π, resulting in
a quadrant change.
Forms the arctangent of a complex variable according to the operation:
IR= ATAN(FACTAX b/a)
where a and b are
the real and imaginary parts, respectively, of the complex variable IA (which
is of the form a + ib). The arctangent represents the phase angle (in
radians), and is valid only for a harmonic analysis (ANTYPE,HARMIC).
Since the scaling factor is applied uniformly to b/a, applying any positive or negative scaling factor will not affect the size of the phase angle, with the exception that a negative scaling factor will change the results quadrant by π. The magnitude of a complex number is still obtained through the ABS command. See POST26 - Data Operations in the Mechanical APDL Theory Reference for details.