- Sas Macro Do Loop Example Free
- Sas Macro Do Loop Example Excel
- Sas Macro Within Data Step
- Sas Macro Do While Loop Example
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Macro Statements |
Executes a section of a macro repetitively based on the valueof an index variable.
Macro statement |
Allowed in macro definitions only |
%END Statement |
Syntax | |
Example | |
Generating a Series of DATA Steps |
Syntax |
For example, using conditional processing to set the value of the index variable beyond the stop value when a certain condition is met ends processing of the loop. Specify integers or macro expressions that generate integers to control the number of times the portion of the macro between the iterative%DO and%END statements is processed. SAS macro loops containing data or proc steps. For each iteration &i of%do-loop, we create a secondary index – macro variable &cntry, which is used as a true index for our loop. During the code compilation, SAS macro processor loops through the%do-loop &i times repeatedly generating SAS code within it, each time with a new value &cntry, thus accomplishing our task.
%DOmacro-variable=start %TO stop <%BY increment>; text and macro language statements |
%END; |
names a macro variable or a text expressionthat generates a macro variable name. Its value functions as an index thatdetermines the number of times the %DO loop iterates. If the macro variablespecified as the index does not exist, the macro processor creates it in thelocal symbol table.
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You can change the value of the index variable duringprocessing. For example, using conditional processing to set the value ofthe index variable beyond the stop value when a certain conditionis met ends processing of the loop.
stop
specify integers or macro expressions thatgenerate integers to control the number of times the portion of the macrobetween the iterative %DO and %END statements is processed.
Here is an example of calling the macro NAMESX in a DATA statement: data%namesx(name=dsn,number=3); Submitting this statement produces the following statement: data dsnx1 dsnx2 dsnx3; See Chapter 3, 'Macro Variables,' for more information about using a period as a delimiter in a macro variable reference. If the condition is false the first time the macro processor tests it, the%DO%WHILE loop does not iterate. Example This example demonstrates using the%DO%WHILE to strip markup (SGML) tags from text to create a TITLE statement. Creating a list of file names for a data step using a macro program. In general, it is always a good idea to write a regular SAS program first, test it and then turn it into a macro program. For example, the following data step will be our base program for stacking the four files together.
The first time the %DO group iterates, macro-variable is equal to start. As processingcontinues, the valueof macro-variable changes by the value of incrementuntil the value of macro-variable is outside the range of integersincluded by start and stop.
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specifies an integer (other than 0) or amacro expression that generates an integer to be added to the value of theindex variable in each iteration of the loop. By default, increment is 1. Increment is evaluated before the first iterationof the loop. Therefore, you cannot change it as the loop iterates.
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Example |
Sas Macro Do Loop Example Free
Sas Macro Do Loop Example Excel
Example 1: Generating a Series of DATA Steps
This example illustrates using an iterative %DO group in a macro definition.
When you execute the macro CREATE, it generates thesestatements:
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Required Arguments
Sas Macro Within Data Step
names a macro variable or a text expression that generates a macro variable name. Its value functions as an index that determines the number of times the %DO loop iterates. If the macro variable specified as the index does not exist, the macro processor creates it in the local symbol table.
You can change the value of the index variable during processing. For example, using conditional processing to set the value of the index variable beyond the stop value when a certain condition is met ends processing of the loop.
specify integers or macro expressions that generate integers to control the number of times the portion of the macro between the iterative %DO and %END statements is processed.
The first time the %DO group iterates, macro-variable is equal to start. As processing continues, the value of macro-variable changes by the value of increment until the value of macro-variable is outside the range of integers included by start and stop.
Sas Macro Do While Loop Example
specifies an integer (other than 0) or a macro expression that generates an integer to be added to the value of the index variable in each iteration of the loop. By default, increment is 1. Increment is evaluated before the first iteration of the loop. Therefore, you cannot change it as the loop iterates.