topic Re: Why the do group is processing even if the condition is not satisfied? in SAS Data Science

Why the do group is processing even if the condition is not satisfied?

devarayalu — Wed, 06 Nov 2013 08:24:03 GMT

Can any one help in this?

data one;

input a b;

datalines;

1 2

2 3

3 4

;

run;

data two;

chk=open('one');

chk1=varnum(chk, 'LINENO');

if chk1 ne 0 then do;

set one;

if LINENO ne 1;

end;

run;

Here the Do group is getting processed and giving note in the log that "Variable LINENO is uninitialised"

Thank you in adnvance.

Re: Why the do group is processing even if the condition is not satisfied?

Tom — Wed, 06 Nov 2013 12:56:37 GMT

SAS compiles the whole data step. So even though the line that references the variable LINENO is inside of a DO loop that will never execute SAS will still create the variable in the program data vector. Hence the warning about the variable never being initialized.

Re: Why the do group is processing even if the condition is not satisfied?

devarayalu — Thu, 07 Nov 2013 03:34:29 GMT

ok thank you and can you please also guide me how to get rid of the message. without changing the if condition

Re: Why the do group is processing even if the condition is not satisfied?

Haikuo — Thu, 07 Nov 2013 04:02:05 GMT

data _null_;

chk=open('one');

chk1=varnum(chk, 'LINENO');

if chk1 ne 0 then call execute(' data two; set one; if lineno ne 1; run;');

run;

Re: Why the do group is processing even if the condition is not satisfied?

devarayalu — Thu, 07 Nov 2013 04:13:37 GMT

Thank you so much for the prompt answer