Do loops in sas pdf example

Loops in sas different loops in sas with their examples. Compare the iteration with the do until and do while examples. Using the iterative do statement without infinite looping. This can be seen in the examples below, where j is the control variable. Place all sas data set variables into a macro variable tree level 3. Browse other questions tagged sas doloops or ask your own question. Included are examples of do and array statement shortcuts. A quick intro to sas arrays and do loops gopinath narasimhan saskatchewan cancer agency march 12, 2014. We will look at many examples, including 1 input and output of files.

Although most sas data step programmers have made use of do loops and arrays, few take. Macro examples using %goto are shown for continue and leave. Different languages use different keywords to define the iteration statement. This paper presents a number of examples to demonstrate how to take advantage of the %do loop to build sas statements dynamically. Loops and arrays you want to know how many diagnoses are in. The sas statements are repeatedly executed until the final value of the index variable is. Arrays are sas data step statements that allow iterative processing of variables and text. Each iteration reduces the value for the variable with. Moreover, we see three important types of loops in sas. The whitlock sub setting loop also known as the do. This paper will move the discussion of doloops in sas beyond only using them for. The sas statements are repeatedly executed till the until condition becomes true.

Coders corner, 5 pp using the whitlock doloop with the prx perl. Sas arrays a sas array is a set of variables of the same type, called elements of the arry, that you want to perform the same operation on. If you specify a while clause,the loop will execute as long as the while expression is true. Since similar processing is generally completed on the array elements, references to the array are.

Loops are fundamental to programming because they enable you to repeat a computation for various values of parameters. Do index, an iterative, or indexed, do loop used to perform the operations in the do loop at a. The following sas code will switch the data to long format and store it as a. Running the same procedure against a series of data sets in previous examples, the % do loop is used to generate single sas statements. Sas do loop, sas do while loop, and sas do until loop with their syntax and examples for. Loops in sas different loops in sas with their examples educba. The output statement is executed before the loop ends. The sas statements are repeatedly executed until the while condition becomes false.

There are four different types of do loops available in sas. In each of the following examples, the do group executes ten times. Array provides a different name to reference a group of variables. Looprepeat algorithm this is the basic pseudocode of a looprepeat block.

It can also be used to dynamically build a series of data steps or proc steps. Sas do while loop this do while loop uses a while condition. In the above example, we declare a variable money initialized with a value of 0, the program loops through the counter loaded with an initial value of 0 to iterate over 10 times. Sas arrays temporarily group and refer to sas variables. Sas do index loop this do index loop uses a index variable for its start and end value. Using do statements, links, and arrays sas support.

Sas do until loop the do until loop uses a until condition. As shown in the next pseudocode example sas provides. Do loop also knowns as iterative do loops are the most basic form of loops that are executed on a sas dataset in the sas data step. Do loops posted 02232010 514 views in reply to lmacdon4 you may consider the sas macro language for this type of repetitive processing, where only. How to use character values on a macro %do loop tree level 3. Lets say you have a series of sas data sets class1 class10. In this example, the do loop is executed when i1 and i2. The following example uses an until clause to set aflag, and then it checks the flag during each iteration of the loop. In the above two examples we see that the do iterative will loop for every. Not a new data structure, the array name is not a variable, and arrays do not define additional variables. A beginners guide to arrays and do loops sas institute. Use an array and a do loop in a new data step to count. The whitlock sub setting loop also known as the do whitlock dow loop and doubledow are illustrated.