Function: calcFunc-arctan

calcFunc-arctan is an autoloaded and byte-compiled function defined in calc-math.el.gz.

Signature

(calcFunc-arctan X)

Source Code

;; Defined in /usr/src/emacs/lisp/calc/calc-math.el.gz
(defun calcFunc-arctan (x)   ; [N N] [Public]
  (cond ((eq x 0) 0)
	((and (eq x 1) (eq calc-angle-mode 'deg)) 45)
	((and (eq x -1) (eq calc-angle-mode 'deg)) -45)
	((Math-numberp x)
	 (math-with-extra-prec 2
	   (math-from-radians (math-arctan-raw (math-float x)))))
	((eq (car x) 'sdev)
	 (math-make-sdev (calcFunc-arctan (nth 1 x))
			 (math-from-radians
			  (math-div (nth 2 x)
				    (math-add 1 (math-sqr (nth 1 x)))))))
	((eq (car x) 'intv)
	 (math-sort-intv (nth 1 x)
			 (calcFunc-arctan (nth 2 x))
			 (calcFunc-arctan (nth 3 x))))
	((equal x '(var inf var-inf))
	 (math-quarter-circle t))
	((equal x '(neg (var inf var-inf)))
	 (math-neg (math-quarter-circle t)))
	((equal x '(var nan var-nan))
	 x)
	(t (calc-record-why 'numberp x)
	   (list 'calcFunc-arctan x))))