topic Re: Array Logic in SAS Programming

Array Logic

robertrao — Fri, 19 Aug 2016 02:43:07 GMT

Hello,

How can I also Include the "N" logic belowif the condition is not satisfied??

Thanks

data want;

set have;

array abiot(10) antibiotic1-antibiotic10;

do i= 1 to 10;

if index(upcase(abiot{i}),'GENTAMICIN') > 0 then GENTAMICIN="Y" ;

drop i;

end;

run;

Re: Array Logic

PGStats — Fri, 19 Aug 2016 03:19:19 GMT

Add

GENTAMICIN = "N";

before the do loop. It will keep that value when "GENTAMICIN" is not present in the array.

Re: Array Logic

Jagadishkatam — Fri, 19 Aug 2016 03:36:16 GMT

Alternatively, an else GENTAMICIN="N" ; within the do loop after the if condition.

Re: Array Logic

PGStats — Fri, 19 Aug 2016 03:44:20 GMT

That's not the same. An else condition will reset GENTAMICIN to "N" even if it has been met earlier. I assumed OP wants GENTAMICIN = "N" only if it is absent in the array.

Re: Array Logic

Reeza — Fri, 19 Aug 2016 03:43:46 GMT

@Jagadishkatam wrote:
Alternatively, an else GENTAMICIN="N" ; within the do loop after the if condition.

No, that will reset it if it's been set to Y, which would be incorrect.

Since your searching for a text string you could concatenate them all and search once though.

If index(CATX (',' , of antibiotic1-antibiotic10), 'GENTAMICIN')> 0 then GENTAMICIN='Y';

else ....='N';

Re: Array Logic

robertrao — Fri, 19 Aug 2016 04:04:41 GMT

Hello PG stats,

I tried this and its resetting all the values to "N"

data want;

set have;

array abiot(10) antibiotic1-antibiotic10;

do i= 1 to 10;

if index(upcase(abiot{i}),'GENTAMICIN') > 0 then GENTAMICIN="Y" ;else GENTAMICIN="N";

drop i;

end;

run;

Re: Array Logic

Reeza — Fri, 19 Aug 2016 04:27:11 GMT

@robertrao wrote:

Hello PG stats,

I tried this and its resetting all the values to "N"

data want;

set have;

array abiot(10) antibiotic1-antibiotic10;

do i= 1 to 10;

　

if index(upcase(abiot{i}),'GENTAMICIN') > 0 then GENTAMICIN="Y" ;else GENTAMICIN="N";

drop i;

end;

run;

That wasn't @PGStats solution. Reread his answer.

Re: Array Logic

RW9 — Fri, 19 Aug 2016 08:26:59 GMT

And just to add to that, the two functions IFC(), IFN() can be used for binary choices like this to remove if/else clause:

gentamycin=ifc(index(CATX (',' , of antibiotic1-antibiotic10), 'GENTAMICIN')> 0,'Y','N');

Re: Array Logic

ballardw — Fri, 19 Aug 2016 15:17:54 GMT

I recomment @PGStats approach and to change this line:

if index(upcase(abiot{i}),'GENTAMICIN') > 0 then GENTAMICIN="Y" ;

if index(upcase(abiot{i}),'GENTAMICIN') > 0 then do;

GENTAMICIN="Y"

leave;

end;

Which will stop going through the loop the first time the condition is met. Since you are not counting or accumulating how many "Y" are involved then stop when you find the first one.

The LEAVE option as above would also resolve the problem of assigning the N if you used the Else approach.