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sarathannapareddy on 07/23/09


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Even you can Use HASH and DOUBLE DASH: It’s that Simple……


 / Published in: SAS
 

URL: http://studysas.blogspot.com/2009/07/even-you-can-use-hash-and-double-dash.html

In order to understand HASH and DOUBLE HASH concept in SAS you need to know about two different ranges of variables:

1) Numbered list:

When a set of variables have the same prefix, and the rest of the name is a consecutive set of numbers, we can use a single dash (-) to refer to an entire range. Some exs.. are….

VAR1 VAR2 VAR3 VAR4 VAR5

Shortcut list you can use to access all 5 variables is VAR1-VAR5

COL1 COL2 COL3 COL4 COL5 COL6 COL7

Shortcut list you can use to access all 7 variables is COL1-COL7

  1. In order to understand HASH and DOUBLE HASH concept in SAS you need to know about two different ranges of variables:
  2.  
  3. 1) Numbered list:
  4.  
  5. When a set of variables have the same prefix, and the rest of the name is a consecutive set of numbers, we can use a single dash (-) to refer to an entire range. Some exs.. are�.
  6.  
  7. VAR1 VAR2 VAR3 VAR4 VAR5
  8.  
  9. Shortcut list you can use to access all 5 variables is VAR1-VAR5
  10.  
  11. COL1 COL2 COL3 COL4 COL5 COL6 COL7
  12.  
  13. Shortcut list you can use to access all 7 variables is COL1-COL7

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Posted By: sarathannapareddy on July 23, 2009

In order to understand HASH and DOUBLE HASH concept in SAS you need to know about two different ranges of variables:

1) Numbered list:

When a set of variables have the same prefix, and the rest of the name is a consecutive set of numbers, we can use a single dash (-) to refer to an entire range. Some exs.. are….

VAR1 VAR2 VAR3 VAR4 VAR5

Shortcut list you can use to access all 5 variables is VAR1-VAR5

COL1 COL2 COL3 COL4 COL5 COL6 COL7

Shortcut list you can use to access all 7 variables is COL1-COL7

2) Name range list: When you refer to a list of variables in the order in which they were defined in the SAS dataset, you can use a double dash (--) to refer to the entire range of variables in between them.

Ex: VAR1 VAR2 VAR3 COUNT VAR4 COL1 VAR5

Shortcut list you can use to access all 7 variables (including COL1, which has different prefix name than others) is VAR1- -VAR5

The general rule you should always remember for dash and double dash is:

Single dash is useful to access the consequently numbered variables.

Double dash is useful to access variables based on their order/position regardless of variable name.

Execute following program in SAS to understand the concept better.

data test; var1=1; var2=2; var3=3; COL=1; var4=4; var5=5; run;

ods listing close; ods rtf file="Single DASH output.rtf" style=rtfout; title1 'Using Single DASH';

proc print data=test; var var1-var5; run;

ods rtf close; ods trace off; ods listing;

ods listing close; ods rtf file="Double DASH output.rtf" style=rtfout; title1 'Using DOUBLE DASH';

proc print data=test; var var1--var5; run;

ods rtf close; ods trace off; ods listing;

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