What is the difference between STR and Nrstr functions?
Using % Signs with %STR
In general, if you want to mask a % sign with a macro quoting function at compilation, use %NRSTR. There is one case where you can use %STR to mask a % sign: when the % sign does not have any text following it that could be construed by the macro processor as a macro name.
How do you mask special characters in SAS?
If you want to mask the special characters from program to compiler, then using the %STR/%NRSTR functions. Otherwise from compiler to executable code, using %BQUOTE/%NRBQUOTE. If you want the trigger will not be resolved, using the “NR” prefixed functions.
How do you add a quote to a macro variable in SAS?
Macro variables in SAS won’t resolve when they are in single quotes, ‘&myvar’ . They need to be in double quotes, “&myvar” , in order to resolve properly. The %’ inside of %str will place a single quote character (or apostrophe) in the text string by itself without causing it to be quoted.
What are SAS macro functions?
SAS macro function is a SAS macro that generates a value. In other words, it is the type 2 macro described above. As any SAS macros, SAS macro functions can have any number (zero or more) of positional or/and named parameters (arguments).
How do I scan a macro in SAS?
The %SCAN and %QSCAN functions search argument and return the nth word. A word is one or more characters separated by one or more delimiters. A delimiter is any of several characters that are used to separate words. You can specify the delimiters in the charlist and modifier arguments.
What is Bquote SAS?
The %BQUOTE function treats all parentheses and quotation marks produced by resolving macro variable references or macro calls as special characters to be masked at execution time. (It does not mask parentheses or quotation marks that are in the argument at compile time.)
What does %unquote do in SAS?
The %UNQUOTE function unmasks a value so that special characters that it might contain are interpreted as macro language elements instead of as text. The most important effect of %UNQUOTE is to restore normal tokenization of a value whose tokenization was altered by a previous macro quoting function.
How do I mask a macro in SAS?
In general, if you want to mask a % sign with a macro quoting function at compilation, use %NRSTR. There is one case where you can use %STR to mask a % sign: when the % sign does not have any text following it that could be construed by the macro processor as a macro name. The % sign must be marked by another % sign.
How do you check special characters in SAS?
You can find a specific character, such as a letter, a group of letters, or special characters, by using the index function. For example, suppose that you have a data file with names and other information and you want to identify only those records for people with “Harvey” in their name.
How do you resolve a macro variable in a quote?
Macro variables can be resolved between single quotation marks using the %STR function inside an %UNQUOTE function. The %UNQUOTE function is recommended to remove any remaining macro delta characters created by the %STR function.
How many types of macros are there in SAS?
two varieties
Macro variables come in two varieties: either local or global. A macro variable’s scope is local if it is defined inside a macro.
How many ways can you create macros in SAS?
3 Easy Ways to Create a Macro Variable in SAS
- In SAS, you create a macro variable with the %LET macro statement, the CALL SYMPUT routine, or the PROC SQL INTO clause.
- The easiest way to create a macro variable in SAS is by using the %LET Macro Statement.
How do I scan a function in SAS?
The most basic use of the SCAN function requires only two arguments. After specifying SCAN and an open parenthesis, the first part of the function is to specify the character string that you are planning to select words from. This can be either a variable or an explicit character string.
What are macro variables?
Macro Variables. A macro variable in SAS is a string variable that allows you to dynamically modify the text in a SAS program through symbolic substitution. The following example demonstrates how to create and use a macro variable. First we set up some system options to have a more concise output style.
What does Bquote mean?
bquote: Partial substitution in expressions
An analogue of the LISP backquote macro.
What is Nrstr in SAS?
%NRSTR (character-string) Details. The %STR and %NRSTR functions mask a character string during compilation of a macro or macro language statement. They mask the following special characters and mnemonic operators: + – * / < > = ¬ ^ ~ ; , blank AND OR NOT EQ NE LE LT GE GT.
How do I unquote a string in SAS?
Match single quotation mark with double quotation mark as if they are the same. Remove matching quotation marks from a character string that begins with a quotation mark; if your string has one or more leading blanks (that is, a quotation mark is not the first character), nothing gets removed (un-quoted).
How do I extract a special character from a string in SAS?
The easiest way to remove special characters from a string in SAS is to use the COMPRESS function with the ‘kas’ modifier.
How do you check if a string contains a character in SAS?
The SAS find() function allows us to check if a given substring of characters is in a character variable in a SAS data step. When working with datasets which contain string and character variables, being able to check if a string contains another string can be very useful.
How do you resolve a macro variable in SAS?
These examples using text expressions show how to assign the text generated by macro LOCATE or assign the value of the macro variable NAME: x=resolve(‘%locate’); x=resolve(‘&name’); the name of a DATA step variable whose value is a text expression.
What is a global macro in SAS?
Global macro variables are variables that are available during the entire execution of the SAS session or job. A macro variable created with a %GLOBAL statement has a null value until you assign it some other value.
What are SAS macro variables?
A macro variable in SAS is a string variable that allows you to dynamically modify the text in a SAS program through symbolic substitution.
How do I assign a macro variable?
The easiest way to create a macro variable in SAS is by using the %LET Macro Statement. This statement creates a macro variable and assigns it a value. You can also use the %LET statement to overwrite the existing value of a macro variable.
How many types of functions are there in SAS?
SAS has more than 190 functions for a variety of programming tasks.
What is the difference between scan and Substr in SAS?
Difference between SCAN and SUBSTR Function. SCAN is used to extract words from a list of words that are separated by delimiters. SUBSTR is used to extract a part of the word by specifying a starting location and the part’s length.