IDL Reference Guide: Procedures and Functions

FOR

The FOR statement executes one or more statements repeatedly, incrementing or decrementing a variable with each repetition, until a condition is met.

Syntax

FOR variable = init, limit [, Increment] DO statement

or

FOR variable = init, limit [, Increment] DO BEGIN

   statements

ENDFOR

Examples

The following example iterates over the elements of an array, printing the value of each element:

array = ['one', 'two', 'three']  
n = N_ELEMENTS(array)  
FOR i=0,n-1 DO BEGIN  
   PRINT, array[i]  
ENDFOR