When the above code is run we get the following output.Because of new computing technologies, machine learning today is not like machine learning of the past. The end of DO loop is achieved through the %end statement while the end of macro is achieved through %mend statement. In the below example the macro named test takes a user input and runs the DO loop using this input value. This macro definition contains a %DO %WHILE loop that ends, as required, with a %END statement. When the above code is run we get the following output. In the below examplewhen the value of the variable "val" becomes 10, the macro terminates else it contnues. Macro %RETURNĮxecution of this macro causes normal termination of the currently executing macro when certain condition evaluates to be true. In the below example the value of the variable 'today' is written to the program log. This macro statement writes text or macro variable information to the SAS log. They are used by other SAS programs without explicitly declaring them.Common examples are - terminating a program when some condition is met or capturing the runtime value of a variable in the program log. SAS has many MACRO statements which are in-built in the SAS programming language. Where make = "&make_" and type = "&type_" The below program decalres a group of SAT staemnets under a macro named 'show_result' This Macro is being called by other SAS statements. It starts with a %MACRO statement and ends with %MEND statement. Macro is a group of SAS statements that is referred by a name and to use it in program anywhere, using that name. But let’s change the type name to 'Wagon' and run the same program. When the above code is run we get the same output as the previous program. Where make = &make_name and type = &type_name In case of bring programs this variable can be referred again and again in any SAS statements. In case we want the result of different make, we need to change the value of the variable make_name without changing any other part of the program. Below program gets us all the observation of the make 'Audi' and type 'Sports'. The variables are used by the SAS statements using the & character appended at the beginning of the variable name. The Macro variable name is any valid SAS variable. Here the Value field can take any numeric, text or date value as required by the program. The local variables are declared with below syntax. They are typically used to supply different variables to the same SAS statements sl that they can process different observations of a data set. These variables can be accessed by SAS programs in which they are declared as part of the program. We use the in-built SAS data set called CARS available in the SASHELP library. The title will show the current date and day without we coding any values for them. Consider a scenario to print the system date in the title of the SAS report every day the report is generated. Exampleīelow is a example of the SAS variable called SYSDATE which represents the system date. In general they are the system assigned variables which are accessed by multiple programs. They are called global macro variables because they can accessed by any SAS program available in the SAS environment. They are declared at the beginning of a SAS program and called out later in the body of the program. These are the variables which hold a value to be used again and again by a SAS program. We will see both of these in the below examples. Macros can also be declared for blocks of code which will be reused multiple times in a similar manner to macro variables. It also helps create dynamic variables within the code that can take different values for different run instances of the same code. SAS has a powerful programming feature called Macros which allows us to avoid repetitive sections of code and to use them again and again when needed.
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