Scripting Guide - SAS

84 JSL Building Blocks Chapter 5
Iterate
y *= 2
Multiplies 1 by 2 and then assigns the result to y. The loop then
repeats while y is less than 287.
); Ends the loop.
Show(y); Shows the value of y (512).
// loop 2
k = 0; Sets k to 0.
While(
Begins the While() loop.
2 ^ k < x, Raises 2 to the exponent power of k and continues evaluating
the loop as long as the result is less than 287.
k++
Increments k to 1. The loop then repeats while 2 ^ k is less than
287.
); Ends the loop.
Show(2 ^ k); Shows the value of 2 ^ k (512).
As with For() loops, Which() loops that always evaluate as true create an infinite loop, which never stops.
To end the loop as the script runs, press ESC on Windows (or COMMAND-PERIOD on Macintosh).
Summation
The Summation() function adds the body results over all i values. The syntax is:
Summation(initialization, limitvalue, body);
For example:
s = Summation(i = 1, 10, i);
returns 55, the result of 1+2+3+4+5+6+7+8+9+10.
The script works like this:
s =
Summation(
Sets the s variable to the value of the function.
Begins the Summation() loop.
i = 1, Sets i to 1.
10, Sets the limit of i to 10.
i All values of i from 1 to 10 are added together, resulting in 55.
); Ends the loop.