Creating Macro Variables Using the %LET Statement or the SYMPUT Routine Arthur X. Li, City of Hope Comprehensive Cancer Center, Duarte, CA ABSTRACT Macro variables are the most essential part of the SAS macro facility. Invoking a macro within another macro is fine, and often a good idea. I attempt to summarize the issue below... Desirabled Target - The FILENAME function assigns the filrf (a system-generated fileref) to the directory that is passed to the macro (&DIR). Calling a macro from another macro is not a problem. You can use %LET to create a macro variable. endstream endobj startxref ... statement may be used outside or within a data step. This statement works much like an assignment statement in the DATA step. One of the easiest ways to define a macro variable is through the %LET statement. The %LET statement is followed by the macro variable name, an equal sign (=), and then the text value to be assigned to the macro variable. Using Macro Variables. First let us see how you use the macro variable in a program. Find more tutorials on the SAS Users YouTube channel. See announcements and FAQ on the SAS Global Forum event site. Below example code runs fine: % LET (Macro Variable Name) = Value; Here the Value field can take any numeric, text or date value as required by the program. 77 0 obj <> endobj %%EOF They are listed below - 1. That sort of message is hard to debug, but the problem should be somewhere within your code (could be missing semicolon sometimes?). h޼V�R#7����w+!-i�U[�2�^�;�)ƒl. SAS® Help Center. (Macro language statements always start with a %). correct month and print the correct title. Details; Program; Program Description; Log; Details. Syntactically speaking, while SAS programming loops or do-loops always reside within SAS data step, SAS macro loops or %do-loops are located within SAS macros. However, in macro, there is no MAX or MIN operator, and macro does not recognize IN or ':', as does the DATA step. %let memcnt=%sysfunc(dnum(&did)); Use the %DO statement to loop through the entire directory based on the number of members returned from the DNUM function. The value is 0 if it is successful or not a 0 if it is not successful. /*Create macro variables with the %LET statement Use macro variables within SAS programs. Since we are all familiar with the TITLE Example. Get Started Writing SAS® Macros . You must be doing something else wrong. What’s the difference between SAS Enterprise Guide and SAS Studio? ; %mend example; %example I coded a macro which I then invoked in a second macro like this: Before I changed it into a macro everything worked fine but now I always get the error. SAS Macro Functions There are some SAS macro functions which help you to execute various operations within a macro. 2. with SAS macros. The %MACRO statement can appear anywhere in a SAS program, except within data lines. The name can refer to a new or existing macro variable. %EVAL Function It is used to perform mathematical and logical operation with macro variables. How are they similar? The %MACRO and %MEND statements are like two slices of bread. SAS macro is a string-based language. 85 0 obj <>/Filter/FlateDecode/ID[<7DA6D4B2158468511DECE595FA4C09DA><4EBEAEB2BAF26E4F87784BA87FA66C45>]/Index[77 23]/Info 76 0 R/Length 60/Prev 96576/Root 78 0 R/Size 100/Type/XRef/W[1 2 1]>>stream I didn't see this before because SAS Studio didn't show the whole log. Hello SAS-L, I have a broad Macro Design as well as a specific code question. I do it all the time. %PDF-1.5 %���� It is only available during macro … and lots of other debugging options can help you debug. The variables are used by the SAS statements using the & character appended at the beginning of the variable name. The general form a %LET statement is %LET macro-variable-name = value; A macro definition cannot contain a CARDS statement, a DATALINES statement, a PARMCARDS statement, or data lines. A %LET statement can define only one macro variable at a time. SAS Macro provides an incredible way to make a process easy and automatic. Once this process is completed, it checks DO LOOP and run iterations and multiply each iteration value by 5 and prints to the log. That sort of message is hard to debug, but the problem should be somewhere within your code (could be missing semicolon sometimes?). I wonder if it is because how I invoked the macro inside the other macro? macro-variable is either the name of a macro variable or a text expression that produces a macro variable name. THE IN(#) OPERATOR WORKS IN A SAS 9.2 MACRO System options need to be defined to get the IN (or #) operator to work inside a SAS 9.2 macro. That makes SAS macro loops a powerful code generator tool allowing to produce multiple variations of SAS code snippets with actually writing them just once. First Step - SAS checks for macro statements/macro variables and executing them. Create a macro variable named &MEMCNT that uses the DNUM function to return the number of members within the directory. Between those slices, you can put any statements you want. Then you can change the value of the macro variable in the %LET statement, and SAS will repeat the new value throughout your program. endstream endobj 78 0 obj <> endobj 79 0 obj <> endobj 80 0 obj <>stream For beginning programmers learning macro Example: Sample %LET Statements. Let's create two macro variables: type and hp. The order in which operations are performed when an expression is evaluated is the same in the macro language as in the DATA step. Use an INFILE statement instead. A macro lets you package a piece of bug-free code and use it repeatedly within a single SAS program or in many SAS programs. If the macro variable that is named in the %LET statement does not exist, it is created in the closest enclosing scope and it is assigned the specified value. If the macro variable that is named in the %LET statement does not exist, it is created in the closest enclosing scope and it is assigned the specified value. In the first %LET statement, we define the macro variable type and assign the mixed-case value Truck. Example 5: Place All SAS Data Set Variables into a Macro Variable . Im invoking this macro for about 100 data sets, but had forgotten one of them in the import macro.. obviously SAS can't compute anything then.. MINOPERATOR (for Macro-In-Operator) must be turned on, because the default is NOMINOPERATOR, and if the delimiter in the match list is not a space, it too must be specified with MINDELIMITER= [6,p.322-3]. Invoking a macro within another macro is fine, and often a good idea. Hey everybody, thank you for your answers!It was actually a way simpler problem. %LET There are several types of macro statements. The Macro variable name is any valid SAS variable. h�b```f``R�l� ��� @N���:���f��,��O����1'�i�N/17f`�jv��2I4�XR)��}b�I����#�r\��������������(�Ѡ������ �8p��U��14H�17�Q����*Wm�>>uI���q�8��c� ��]@l��X!�3� �-� I reckon it might be the use of comment strings like /*----*/ in the macro causing issues. Details. Example - %let x = 10; %let y = 20; %let z = &x * &y; %put &z; It returns "10*20". This is time -consuming and prone to errors. Let’s see how SAS Macro … Change to the macro comment style: %*------; Actually, /* */ comments are fine in a macro. Luisa Hartman, Jane Liao, Merck Sharp & Dohme Corp. ... Let's take a detailed look at macro variables beginning with a definition, and then three ways to create a macro variable, ... defined within a macro is by default a local macro variable. One can create macro variables by using either the %LET statement or the SYMPUT routine. The simplest, but very useful, form of the macro language is the assignment statement. After a macro variable is created, you typically use the variable by referencing it with an ampersand preceding its name (&variable-name), which is called a macro variable reference.These references perform symbolic substitutions when they resolve to their value. Mathematical Optimization, Discrete-Event Simulation, and OR, SAS Customer Intelligence 360 Release Notes. By default, a defined macro is an entry in a SAS catalog in the WORK library. You can think of a macro as a kind of sandwich. 99 0 obj <>stream To do so, you must use the %NRSTR function to mask the & and prevent the resolution of the macro variable, as in the following example: %macro example; %local myvar; %let myvar=abc; %put %nrstr(The string &myvar appears in log output,); %put instead of the variable value. Because macro variables are resolved before the another macro variable or pieces of names of MACRO VARIABLE RESOLUTION A macro variable may be appended to SAS code %LET SEX=MALE; DATA &SEX.ONLY; SET CLASS.&SEX; RUN; This code will resolve to: DATA MALEONLY; SET CLASS.MALE; WHERE SEX="MALE"; RUN; It is not uncommon within the SAS Language This macro uses the ATTRN and VARNAME functions to retrieve all the variables contained within a SAS data set and places them into one macro variable. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. The core issue that I am having trouble with is "how to code nested macros that uses PROC SQL, within another macro that is invoked within a SAS procedure?". h�bbd``b`� $�C�`}$���� !�H�*b`bd�R��H.��@� �� Create two macro variables, &RC will contain the results from the FILENAME function. Here, we will see different SAS Macro Variables, functions of Macro in SAS Programming Language. value is a character string or a text expression. macro language objects - macro variables referenced as &somename, and macros referenced as %somename. If the macro variable that is named in the %LET statement already exists in any enclosing scope, the %LET statement updates the value. 0 Omitting value produces a null value (0 characters). In this case, it sets i is equal to 1 , then writes a log " the value of i is equal to 1" . Operations within parentheses are performed first. %let city=New Orleans; Now you can use the macro variable CITY in SAS statements where you would like the text New Orleans to appear. I use them all the time. SAS macro is a text processing facility, so all values are assumed to be text. 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