NCL Website header
NCL Home > Documentation > Functions > General applied math

acos

Computes the inverse cosine of numeric types.

Prototype

	function acos (
		value  : numeric   
	)

	return_val [dimsizes(value)] :  float or double

Arguments

value

One or more values of any dimension -1.0 &le value &le 1.0

Return value

Returns an array dimensioned the same as value, in radians. The return type is double if the input is double, and float otherwise.

Description

This function returns the inverse cosine of each element of value, in radians. Missing values are ignored.

See Also

asin, atan, atan2

Examples

Example 1

  f = -1.0
  acos_f = acos(f)
  print(acos_f)        ; Should be 3.141593

Errors

If value is not -1.0 &le value &le 1.0, nan is returned.