What is the difference between index and Indexc in SAS?
The INDEXC function searches for the first occurrence of any individual character that is present within the search expression, whereas the INDEX function searches for the first occurrence of the search expression as a pattern.
What is index in SAS dataset?
An index is an optional file that you can create for a SAS data file in order to provide direct access to specific observations. The index stores values in ascending value order for a specific variable or variables and includes information as to the location of those values within observations in the data file.
Do do functions SAS?
The DO UNTIL statement executes statements in a DO loop repetitively until a condition is true, checking the condition after each iteration of the DO loop. The DO WHILE statement executes statements in a DO loop repetitively while a condition is true, checking the condition before each iteration of the DO loop.
What is index loop in SAS?
SAS – DO Index Loop. This DO Index loop uses a index variable for its start and end value. The SAS statements are repeatedly executed until the final value of the index variable is reached.
How do you do a DO loop in SAS?
DO loops in the DATA step. The basic iterative DO statement in SAS has the syntax DO value = start TO stop. An END statement marks the end of the loop, as shown in the following example: data A; do i = 1 to 5 ; y = i **2; /* values are 1, 4, 9, 16, 25 */ output ; end ; run; By default, each iteration of a DO statement increments the value
What happens at the end of the data step in SAS?
After SAS has added 3 to the answer variable four times, SAS exits the DO loop, and since that’s the end of the DATA step, SAS moves onto the next procedure and prints the result. The other thing you might want to notice about the DATA step is that there is no input data set or input data file.
What is the syntax for iterative do statements in SAS?
A basic iterative DO statement in the SAS/IML language has exactly the same syntax as in the DATA step, as shown in the following PROC IML statements: proc iml; x = 1:4; /* vector of values {1 2 3 4} */ do i = 1 to 5; z = sum (x##i); /* 10, 30, 100, 354, 1300 */ end; In the body of the loop, z is the sum of powers of the elements of x.