FINITE Function

Returns a value indicating if the input variable is finite or not.

result = FINITE(x)

x A scalar or array expression of single-precision complex, double-precision complex, single-precision floating point, or double-precision floating point data type.

result Returns 1 if x is finite. Returns 0 if x is infinite or not a defined number (NaN). Undefined numbers result from ill-defined operations, such as dividing zero by zero, or taking the logarithm of zero or a negative number.

None.

fmach = MACHINE(/Float)

; Get the single-precision, floating-point machine constants. 

a = [fmach.nan, 3.0, fmach.pos_inf, 5.2, $
    fmach.neg_inf]

; Create a five-element vector containing single-precision, 
; floating-point NaN, positive infinity, negative infinity, and 
; finite values.

b = FINITE(a)

; View result of FINITE.

INFO, b

B                   BYTE                 = Array(5)

FOR i = 0, 4 DO PRINT, a(i), b(i)

NaN           0
3.00000   1
Inf           0
5.20000   1
-Inf         0

; Print vectors a and b. Note that vector b contains a 0 when
; NaN or infinity occurs in a. Vector b contains a 1 at the indices
; where vector a contains finite values.

CHECK_MATH, ON_ERROR, ON_IOERROR

For more details, see Chapter 10, Programming with PV-WAVE, in the PV-WAVE Programmer's Guide.