J3/06- 114r1
Subject: ATAN with two arguments works like ATAN2
From: David Muxworthy for /jor
References: J3-026
Revised Suggested edits (cf 06-114)
[294:27] After "ATAN(X)" add "or ATAN(Y,X)"
[298:16+15] After "ATAN" in the first column in the table in 13.6, insert "(X)".
[305:28] After "ATAN(X)" add " or ATAN(Y,X)"
[305:31-35] Change to read:
Arguments.
Y (optional) shall be of type real or complex.
X shall be of type real or complex.
Result characteristics. Same as X.
Result value. If Y is present the result is the same as the result of ATAN2(Y,X).
If Y is absent and X is real the result is expressed in radians and lies has a value equal to a processor-dependent approximation to arctan(X) that lies in
the range -pi/2 .le. ATAN(X) .le. pi/2.
If Y is abent and X is complex the result is complex. The real part isexpressed in radians and lies in
the range $-\frac\pi2 \leq$ REAL(ATAN(X)) $\leq \frac\pi2$."
Note to editor: these edits assume paper 05-204r2 has passed.