Select DISTINCT strm||'*'||acad_career as key, STRM, ACAD_CAREER Hello I would like to do a do loop over a list selected from a proc sql small data set. The following example iterates over a few terms in the Fibonacci sequence: The syntax in the DATA step is to specify a list of values (numeric or character) after the equal sign. SAS doesn't support that syntax directly, but there is a variant of the DO loop in which you can iterate over values in a specified list. Some languages support a 'foreach loop' that iterates over objects in a collection. To prevent this behavior, use a DO loop with a WHILE clause. It is worth noting that a DO loop with an UNTIL clause always executes at least one time because the condition is evaluated at the end of the loop. SAS also supports a DO WHILE and DO UNTIL syntax that does not involve using a counter variable. Consequently, the examples have two stopping conditions: a maximum number of iterations and the WHILE or UNTIL criterion. If the condition is not satisfied when i=5 (the last value for the counter), the loop stops anyway. In these examples, the iteration stopped because the WHILE or UNTIL condition was satisfied. When i=4, the WHILE condition is not satisfied, so the loop iterates again. The following statements extend the DATA step example and iterate as long as the value of y is less than 20. The condition is checked before each iteration, which implies that you should intialize the stopping condition prior to the loop. You can use the DO statement with a WHILE clause to iterate while a condition is true.

There are two ways to do this: you can use the WHILE clause to iterate as long as a certain condition holds, or you can use the UNTIL clause to iterate until a certain condition holds. On occasion, you might want to stop iterating if a certain condition occurs.

Variations on the DO loop: DO WHILE and DO UNTIL As mentioned in the previous section, you can also use the BY option to increment the counter by non-unit values and by negative values. In the body of the loop, z is the sum of powers of the elements of x.Дuring the ith iteration, the elements of x are raised to the ith power. An END statement marks the end of the loop, as shown in the following example: The basic iterative DO statement in SAS has the syntax DO value = start TO stop. Older languages, such as FORTRAN and SAS, call the iteration statement a 'do loop,' but it is exactly the same concept. The most well-known statement is the 'for loop,' which is used by C/C++, MATLAB, R, and other languages. Different languages use different keywords to define the iteration statement. Loops are fundamental to programming because they enable you to repeat a computation for various values of parameters. I'll describe looping in the SAS DATA step and compare it with looping in the SAS/IML language. Today is the first anniversary of this blog, which is named The DO Loop, so it seems appropriate to blog about DO loops in SAS. Whether you need to iterate over parameters in an algorithm or indices in an array, a loop is often one of the first programming constructs that a beginning programmer learns. Looping is essential to statistical programming.

Foreach loop in r