In order to make it run for numeric variables, we first need to convert numeric variables. The output of PUT() function is always character, the input can be character or numeric.Ī good explanation of informats and formats can be found here. The SUBSTR() / SUBSTRN() function works only for character variables. The source variable of INPUT() function must always be character, the output can be character or numeric. The PUT() function can also be used to convert a character variable to another character variable, with a character format. In the PUT() function, the format must be the same type as the source variable (oldvar_num), so numeric.
NUMERIC TO CHARACTER SAS HOW TO
The format tells SAS how to output or store the data. The PUT() function is similar to writing out data using the PUT statement. To convert a numeric variable to a character variable, you use the PUT() function (which uses formats). When converting from character to numeric, the informat must be the type you are converting to, so numeric.
The informat tells SAS how to read the data, and it should be read as numeric. In this lesson, I go over how to convert character variables to numeric variables, and how to convert numeric characters to character variables, using SAS.On. The INPUT() function is similar to reading external data using the INPUT statement. newvar_num = INPUT(oldvar_char, informat) data one įalg=ifn(verify(strip(val), '.To convert a character variable to a numeric variable, you use the INPUT() function (which uses informats). If there are no characters in target-expression that are unique from those in search-expression, VERIFY returns a 0. If you want to check if a string is numeric in SAS in a simple and fast way: you can use Verify Function, which returns the position of the first character in a string that is not in the search string. Below we show in more detail how to use the FORMAT statement to format numeric, character, and date variables. l)) if you aren't happy with the default alignment of right aligned for shorter-than.
Just be aware you may need to use the optional alignment option ( put (x,10. Keep extending it if you want it more than 10. xchar put (x,10.) That asks for it to be put in 10 characters. This function uses the following basic syntax: numericvar input (charactervar, comma9.) The following example shows how to use this function in practice. FORMAT variable-name (s) format-name variable-name (s) format-name variable-name (s) format-name Example: FORMAT income expenses DOLLAR10.2 transactiondate MMDDYY10. So of course it is 1.2345e9 that's what it can fit in 8 characters. Check if a string is numeric Using the Verify function You can use the input() function in SAS to convert a character variable to a numeric variable. The newly formed data set contains observations containing only numeric characters including any periods. This observation is deleted and execution returns to the top of the DATA step. When the result of anydigit is 0 and anyalpha is greater than 0, it means there is a non-alphanumeric character is in the value.
Within the loop from 1 to length of Val, the SUBSTR function pulls off each byte of Val and evaluates it with ANYALPHA and ANYDIGIT. Label compress ="Compress(val)" lengthn ="Lengthn(compress)" įlag=ifn(lengthn(compress(val,, 'ka')), 0, 1) Check if a string is numeric using the combination of LENGTHN and COMPRESS Function. In the 9th observation, val=123456789a would return the flag as 1(numeric) as it would only be checking the first 8 bytes of the string.
Thus, In the 8th observation, Val is “123a5678”, SAS returned the flag as 0 (non-numeric). Note that the input format in the above example is “8.” So only the first 8 bytes of the character string are checked. If you want to check if a string is numeric in SAS in a simple and fast way: you can use Verify Function, which returns the position of the first character in a string that is not in the search string. The variable FLAG will be set to 1 if the value is numeric including any decimal, otherwise, FLAG will be set to 0. The ? modifier also suppresses the invalid data message and, in addition, prevents the automatic variable _ERROR_ from being set to 1 when invalid data are read.īelow is an example of using ? to determine whether a variable contains non-numeric values or not: data one įlag=ifn ((input(val, ? 8.) eq.
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