loops can and should be used, how to set up an ARRAY with and without specifying the number of array elements, and determine what type of DO loop is most
Iterative Do groups loop through a body of code until stopped by the control variable There are three types of Do groups that are Iterative: Index Variable, Do
Arrays are SAS data step statements that allow iterative processing of variables and text We will look at many examples, including 1) input and output of files using
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Although most SAS DATA step programmers have made use of DO loops and arrays, few take full advantage of the power and flexibility of these tools There are
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A SAS array is a collection of SAS variables that can be referenced in the Data of the ARRAY statement and the DO loop has enabled us to process a group of
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A DO statement designates a group of other statements to be run by SAS • An END statement shows where the group ends – you will get an error and no
simple arrays
This paper will move the discussion of DO-loops in SAS beyond only using them for arrays as it begins with the underlying conceptual basis It will then cover
DoLoop
•Statements within a DO loop execute for a execute SAS code conditionally SAS DATA mylib loop2; set mylib loop; array alldx (5)$dx1 dx2 dx3 dx4 dx5;
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The explicit loop, which utilizes the iterative DO, DO WHILE, or DO UNTIL statements, is used to repetitively execute certain SAS® statements within each iteration
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It is a compile-Gme only statement If you do not specify the elements of the array, SAS automaGcally creates new variables range; DO loop stops processing
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One way is to use SAS ARRAYs and DO loops. SAS ARRAYS. A SAS ARRAY is a set of variables of the same type that you want to perform the same operation on.
The solution to overcome the inefficiency is to use a SAS ARRAY with a subsequent DO loop. We will first define two different types of arrays the indexed array
Arrays are SAS data step statements that allow iterative processing of variables and text. We will look at many examples including 1) input and output of files
Arrays are SAS DATA step statements that allow clever programmers to do a great deal of work with the end of the do loop is encountered and the process.
https://support.sas.com/resources/papers/proceedings/pdfs/sgf2008/179-2008.pdf
How can a beginning SAS programmer write less SAS code for this type of data preparation that is also more efficient? One way is to use SAS ARRAYs and DO loops.
5 mai 2016 This paper looks at arrays with particular application to diagnosis codes; this application has been of interest to SAS programmers for years ...
The explicit loop which utilizes the iterative DO
are placed in an ARRAY a. DO loop processing is necessary to loop through all of them. The SAS code in the form of an. ARRAY and DO loop:.
How can a beginning SAS programmer write less SAS code for this type of data preparation that is also more efficient? One way is to use SAS ARRAYs and DO loops.
to perform the data manipulations on the array(s) Within a DATA step a DO loop is used to specify a set of SAS statements or operations that are to be performed as a unit during an iteration of the loop It is important to note that operations performed within a DO loop are performed within an observation Another thing that you need to be
DO loops are used to specify the operation across the elements in the array This workshop will show you how to create an array and utilize DO loops to perform operations on the elements in an array create new variables and change short wide to a long and skinny data structure INTRODUCTION
A SAS ARRAY is a set of variables of the same type that you want to perform the same operation on The set of variables is then referenced in the DATA step by the array name The variables in the array are called the “elements” of the array Arrays can be used to do all sorts of things
THE DO LOOP Because arrays are easily referenced with an index value they are very often used with a do loop There are three types of do loop The first type of DO loop uses a list (either numeric or character) and the loop is executed once for each value in the list specified in the do loop
The SAS software array and do statements are a simple programming tool which allow a programmer to access a list of variables The macro language allows a programmer to access a list of items with a Do; statement but lacks a speci?c Array statement
In SAS data step it’s called an ARRAY A group of variables defined in a data step All elements must be character or numeric Array elements don’t need to be contiguous the same length or even related at all How do we use arrays? Use arrays to read and analyze repetitive data with a minimum of coding
Do until in SAS?
The DO UNTIL loop uses a UNTIL condition. The SAS statements are repeatedly executed till the UNTIL condition becomes TRUE. Syntax DO UNTIl (variable condition); . . . SAS statements . . . ; END; Example DATA MYDATA; SUM = 0; VAR = 1; DO UNTIL(VAR>5); SUM = SUM+VAR; VAR+1; END; PROC PRINT; RUN;
Do while vs while loop?
While loop checks the condition first and then executes the statement (s), whereas do while loop will execute the statement (s) at least once, then the condition is checked. While loop is entry controlled loop whereas do while is exit controlled loop.
Do while in SAS?
In SAS there are three basic loops that are DO LOOP, DO UNTIL and DO WHILE Here we are introducing DO WHILE LOOP. It is a control flow statement. In SAS statement repeatedly executes as per the condition until the while condition becomes false.
Paper 158-2010 - How to Use ARRAYs and DO Loops