Macro XSET (from Fraktal SAS Programming): Unterschied zwischen den Versionen

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# The Macro first defines the OS command '''''"SET"''''' as text data source ('''''SAS''''' file reference) of type '''''"PIPE"''''' that delivers a dynamic two-column matrix with delimiter '''"="''' upon reference to the fileref.
 
# The Macro first defines the OS command '''''"SET"''''' as text data source ('''''SAS''''' file reference) of type '''''"PIPE"''''' that delivers a dynamic two-column matrix with delimiter '''"="''' upon reference to the fileref.
 
 
# This fileref is then used to dynamically "populate" a '''"data step view"''' that serves as data source for subsequent processing.
 
# This fileref is then used to dynamically "populate" a '''"data step view"''' that serves as data source for subsequent processing.
 
 
# From the left side of the matrix accessed the macro obtains the names of the OS environment variables and stores them as blank-separated list into a macro variable for use later on.
 
# From the left side of the matrix accessed the macro obtains the names of the OS environment variables and stores them as blank-separated list into a macro variable for use later on.
 
 
# Finally a data step with name '''"_NULL_"''' is used to write the two-variable dataset delivered by the data step view into the global symbol table.
 
# Finally a data step with name '''"_NULL_"''' is used to write the two-variable dataset delivered by the data step view into the global symbol table.
  

Version vom 11. August 2014, 19:58 Uhr

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What it does

This SAS Macro transfers the environment from the particular operating system to SAS Macro variables.

  • Characters "not appreciated" by SAS are removed from variable values.
  • If a specific variable name is supplied, this will be the only one transferred.
Code executed Function performed

%MACRO xset(xvar);

Start Macro definition with name and positional parameter xvar

filename path pipe "set" lrecl = 2048;

Open source for text data of type pipe pointing to OS command

data ecotope / view = ecotope;

length xvar $256 xval $1024;

Declare variables xvar and xval by length in bytes

infile path dlm = '=';

Utilize data stream from data source path

input xvar $ xval $;

Define structure of data stream path with variables xvar and xval

xvar = upcase(translate(xvar,'_','(-)'));

Remove unwanted characters from variable xvar

%IF %LENGTH(&XVAR.) != 0 %THEN %DO;

Specify condition on macro parameter xvar for using code segment

if trim(xvar) = "%UPCASE(&XVAR.)";

Conditionally executed code

%END;

End condition on macro parameter xvar

run;

proc sql noprint;

select xvar

into :xvar_l separated by ' '

from ecotope

 ;

quit;

%GLOBAL &XVAR_L.;

data _NULL_;

Start datastep run group

set ecotope;

call symput(compress(xvar),compress(xval));

Transfer variable values to symbol table

run;

End data step run group

filename path clear;

Close source for text data

%MEND xset;

End Macro definition with name

How it is done

  1. The Macro first defines the OS command "SET" as text data source (SAS file reference) of type "PIPE" that delivers a dynamic two-column matrix with delimiter "=" upon reference to the fileref.
  2. This fileref is then used to dynamically "populate" a "data step view" that serves as data source for subsequent processing.
  3. From the left side of the matrix accessed the macro obtains the names of the OS environment variables and stores them as blank-separated list into a macro variable for use later on.
  4. Finally a data step with name "_NULL_" is used to write the two-variable dataset delivered by the data step view into the global symbol table.

Special Effects

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