atan

Mapdl.atan(ir='', ia='', name='', facta='', **kwargs)

Forms the arctangent of a complex variable.

APDL Command: ATAN

Parameters:

ir

Arbitrary 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.

ia

Reference number of the complex variable to be operated on.

name

Thirty-two character name for identifying the variable on the printout and displays. Embedded blanks are compressed upon output.

facta

Scaling 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.

Notes

Forms the arctangent of a complex variable according to the operation:

IR = ATAN(FACTA X 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.