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Using the same logic as the SUBSTR function, since the length of REP is determined in the compile stage and since the number of repetitions could vary, SAS gives it a default length of 200. The REPEAT function takes a string and copies it as many times as provided by the second argument to the function. SAS gives the variable defined by the SUBSTR function the longest length it possibly could-the length of the string from which you are taking the substring.įinally, the REP variable is created by using the REPEAT function. Since SAS has to determine variable lengths in the compilation stage, the SUBSTR arguments that define the starting point and the length of the substring could possibly be determined in the execution stage. The SUBSTR function can extract some or all of one string and assign the result to a new variable. LENGTH GENDER $ 6 Ĭontinuing further, the variable SUB has a length of 8. TIP: It is a good practice to use a LENGTH statement to avoid truncation of data. As a result, you will have GENDER = ‘FEMA’. The length of GENDER in the above example is 4 since the statement in which the variable first appears defines the length. Note: If a variable appears several times in a data step, its length is determined by the first reference of that variable. So, the length of these variables is equal to the number of bytes in the literals following the = sign. LEFT and RIGHT variables are created with an assignment statement.Var2 is read with an informat, the length is set to be 3.Since no informat is used SAS will give a default length of 8. The VARNUM option requests the variables to be in the order that they appear in the SAS data set. Title "proc contents for data set example1" Let’s look at each of the character variables created in the data step by using Proc contents. *4 Blanks and x*/sub=substr(var1, 1, 2) Example 1: How Length of variables is determined in SAS data example1 In SAS variables are determined whether to be a character or numeric during the compile stage of the data step. These can include truncation of data, Incorrect results, and even some of the errors like INVALID arguments. Understanding the basics will avoid some of the common pitfalls which can arise when applying the SAS character function. SAS REVERSE Function How does SAS store or determine the length of character data?īefore we start with applying character functions, it is important to understand how SAS stores any character data.SAS Character Functions to count the number of letters or substrings in a string.
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SAS Character Functions that compute the length of strings.SAS Character Functions to Substitute Letters or Words in Strings.SAS Character Functions That Compare Strings (Exact and “Fuzzy” Comparisons).
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