asin(x [, degrees:T or radians:T or cycles:T]), x REAL or a structure with REAL components value in radians (default), cycles, or degrees as specified by option "angles" or the optional keyword |

asin(x) computes the inverse sine of the elements of x, where x is a REAL scalar, vector, matrix or array. The result has the same shape as x. sin(asin(x)) is the same as x except for rounding error. The units of the result are radians, degrees or cycles as determined by the value of option 'angles'. The default is radians. See subtopic 'options:"angles"'. asin(x, radians:T), asin(x, degrees:T), asin(x, cycles:T) return results in the indicated units, regardless of the value of option 'angles'. When any element of x is MISSING or is above 1 or below -1, the corresponding element of the result is MISSING and a warning message is printed. When x is a structure, all of whose non-structure components are REAL, asin(x [,UNITS:T]), where UNITS is one of 'radians', 'degrees' or 'cycles', is a structure of the same shape and with the same component names as x with each non-structure component transformed by asin(). Cmd> vector(asin(.5),asin(.5,degrees:T),asin(.5,cycles:T)) (1) 0.5236 30 0.083333 See topic 'transformations' for information on asin().

Gary Oehlert 2003-01-15