Nyquist / XLISP 2.0  - 
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asin
  | Type: | - | Lisp function (closure) | 
  | Source: | - |  | 
Syntax
- (asin expr)
- expr - floating point number/expression
 returns - the arcsine of the number
 
Note: The 'asin' function is not imlemented in Nyquist. Here is a
Lisp implementation of 'asin', using the atan
function:
(defun asin (x)
  (cond ((not (numberp x)) (error "bad argument type" x))
        ((= x 1) (/ pi 2.0))
        ((= x -1) (/ pi -2.0))
        ((< -1 x 1) (atan (/ x (sqrt (1+ (* x (- x)))))))
        (t (error "argument out of range" x))))
Description
The 'asin' function returns the arc sine of a floating point
expression. The result is a floating point number in radians.
If the argument is less than -1 or greater
than +1, the arc sine is a complex number. Complex
numbers are not available in XLISP. In this case
the 'asin' function signals an 'argument out of range' error.
Examples
(asin 0.0)   => 0.0
(asin 1.0)   => 1.5708
(asin -1.0)  => -1.5708
(asin 0)     => error: bad integer operation
See also:
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Nyquist / XLISP 2.0  - 
Contents |
Tutorials |
Examples |
Reference