![]() To typecast numeric to character in SAS we will be using PUT() function. Like wise if you wanted to remove spaces form the string and only keep underscores you could update the regular expression to look like this //i. In order to typecast character to numeric in SAS we will be using INPUT() function. Not the differece between the two is the use of the ^ symbol in the regular expression.Īdditionally if you wanted to add a character to ignore like for example an underscore the code from line 30 onwards shows you how. Example: Convert Character Variable to Numeric in SAS. Related: How to Convert Numeric Variable to Character in SAS. Then if the result of the prxmatch() condition is true, we use prxchange() to first extract all special characters (populating special_chars_list) and secondly to create a new string without any special characters ( clean_string). numericvar input (charactervar, comma9.) The following example shows how to use this function in practice. I am using the following code: data want set have med2dose input (med2dose, 6.) run The data are purely numbers (ie 1, 20, 25, 100, 250, etc.) Whenever I run this code all of the numeric data is lost in the new variable but it is converted to character. This returns true or false and basen on this result we update column special_char_found. I am having trouble converting numeric data into character data. Output ExplanationĪt line 18 we use prxmatch() to identify if our string contains any special characters according to the regular expression passed as argument one //i. The SAS INPUT function is a way to reread a variable into another informat. ![]() ![]() One for reading specific formats of the numeric data which is called informat and another for displaying the numeric data in specific. It uses these formats at the end of the variable names to apply a specific numeric format to the data. Codeīelow is the same SAS code showing you how to use the prxchange() and prxmatch() functions in a datastep. Converting a character variable to a number. SAS can handle a wide variety of numeric data formats. It utilises the prxchange() function to remove any characters not specified in the perl regular expression argument. The below SAS code is one way to remove non alphanumeric characters from a string when working with SAS code. How to: check for, identify and remove non-alphanumeric characters when working with strings in SAS base code. 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 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. So SAS assumes you just left the off the front of your character format name. format, where w is the width of the character variable and has a maximum value of 32. Once you have converted the data to a character string then you can no longer use the numeric MMDDYY format with the value. If you define a character variable and assign the result of a numeric expression to it, SAS tries to convert the numeric result of the expression to a character value using the BEST w. In the PUT() function, the format must be the same type as the source variable (oldvar_num), so numeric. Well you can, but that just means SAS will automatically convert the number into a string using the BEST12. The format tells SAS how to output or store the data. The PUT() function is similar to writing out data using the PUT statement. This should be a simple task, by first converting the variable to character, and using the appropriate format: LASTATTEMPT PUT (ATTMPT1,YYMMDDS10.) When a proc contents is run on the data set, it confirms that this has been converted to a character variable. 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. Numeric data <- ame(x1, x2, x3, x4, Create data frame stringsAsFactors FALSE) sapply(data. The INPUT() function is similar to reading external data using the INPUT statement. How to Convert Character to Numeric Example Vector. newvar_num = INPUT(oldvar_char, informat) To convert a character variable to a numeric variable, you use the INPUT() function (which uses informats). Obviously, if a variable contains non-numeric information (e.g., names) then it should be saved as a SAS character variable.
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