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(Math Functions): Document the optional second arg of atan.

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This commit is contained in:
Eli Zaretskii 2002-02-19 11:03:54 +00:00
parent 250ffca65e
commit f120431c7e
1 changed files with 6 additions and 3 deletions
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9
lispref/numbers.texi
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@ -1046,8 +1046,8 @@ pi
is out of range (outside [-1, 1]), then the result is a NaN.
@end defun
@defun atan arg
The value of @code{(atan @var{arg})} is a number between
@defun atan y &optional x
The value of @code{(atan @var{y})} is a number between
@ifnottex
@minus{}pi/2
@end ifnottex
@ -1061,7 +1061,10 @@ pi/2
@tex
@math{\pi/2}
@end tex
(exclusive) whose tangent is @var{arg}.
(exclusive) whose tangent is @var{y}. If the optional second
argument @var{x} is given, the value of @code{(atan y x)} is the
angle in radians between the vector @code{[@var{x}, @var{y}]} and the
@code{X} axis.
@end defun
@defun exp arg