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SAS: capture the condition when number of records > 100

 
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ganeshcet

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Joined: 25 Jan 2007
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Location: New York

PostPosted: Tue May 08, 2007 5:37 am    Post subject: SAS: capture the condition when number of records > 100
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Hi
i have question on sas.in sas program currently i am using array

array branch(100) _temporary_ ;

then later

branch(i) = a+b;

where 100 is the number if records in the input file .i add a+b for all branches. (just looping it) .Now i want to capture the condition when number of records is more than 100. how can i know the count first and set it ? please help .
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expat

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Joined: 14 Mar 2007
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Location: Back in jolly old England

PostPosted: Tue May 08, 2007 1:02 pm    Post subject:
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You want to know the number of branches before you build your array ?
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Phrzby Phil

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Joined: 31 Oct 2006
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Location: Richmond, Virginia

PostPosted: Tue May 08, 2007 5:56 pm    Post subject:
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For a small-ish file:

1. DATA step #1 reads the file, counting records, and at end sets the value of a macro variable to this number

2. DATA step #2 can now do better than what you wanted. It can size the array using the macro variable, thereby effectively dynamically allocating the array to just the size you want

3. DATA step #2 then re-reads the file, knowing that the array is sized correctly
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expat

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PostPosted: Tue May 08, 2007 6:20 pm    Post subject:
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If the input data is already in SAS format you could just use the NOBS keyword to get the number of observations in the dataset.

SET &FILEIN (OBS=1) NOBS=NNN;
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ganeshcet

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PostPosted: Wed May 09, 2007 9:41 pm    Post subject:
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Hi
thanks for the help.
here is the code for the macro variable.

DATA _NULL_;
INFILE inputfileddname END=EOF;
INPUT;
IF EOF THEN
CALL SYMPUT('X',_N_);
RUN;

DATA _NULL_;
array arrayvariable(&x) _temporary_;
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Phrzby Phil

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PostPosted: Thu May 10, 2007 6:14 pm    Post subject:
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Thanks for posting your resolution.
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