N_ELEMENTS Function

Returns the number of elements contained in any expression or variable.

result = N_ELEMENTS(expr)

expr The expression for which the number of elements will be returned.

result The number of elements contained in any expression or variable.

Scalar expressions always have one element. The number of elements in an array is equal to the product of its dimensions. If expr is an undefined variable, N_ELEMENTS will return zero.

None.

In this example, N_ELEMENTS is used to determine the number of elements in a two-dimensional array.

a = INDGEN(3, 2)

; Create a 3-by-2 integer array.

PRINT, a

0       1       2
3       4       5

PRINT, N_ELEMENTS(a)

; Display the number of elements in a.

DELVAR, a

; Delete the variable a.

INFO, a

VARIABLE       UNDEFINED = Undefined

PRINT, N_ELEMENTS(a)

N_PARAMS, N_TAGS, PARAM_PRESENT, SIZE, TAG_NAMES