topic Re: ERROR: (execution) Invalid subscript or subscript out of range. in SAS/IML Software and Matrix Computations

ERROR: (execution) Invalid subscript or subscript out of range.

desireatem — Fri, 10 Jan 2014 19:43:30 GMT

Hi There, what is wrong with this code?

proc iml;

use kaplan;

read all var{monset Survival survival1} into DM;

close;

Survival1 = DM[,3]; Survival = DM[,2]; monset = DM[,1]; /*Survivalival is second column*/ /*monset is first column*/

n = nrow(DM); /*number of rows in the dataset = obs*/ /*THE N DOESNT NEED TO BE FIXED*/

segment = J(nrow(DM),1,1); *print segment;

do i = 2 to nrow(DM);

if monset=monset[i+1] then survival1=survival1[i+1];

if monset[i-1]=monset then survival1[i-1]=survival1;

if monset=monset[i-1] then survival1=survival1[i-1];

end;

create Mkaplan var{monset Survival survival1};

append;

quit;

ERROR: (execution) Invalid subscript or subscript out of range.

operation : [ at line 872 column 20

operands : monset, _TEM1002

MONSET 141 rows 1 col (numeric)

_TEM1002 1 row 1 col (numeric)

142

Reeza — Fri, 10 Jan 2014 19:51:34 GMT

It's a valid error. You've told the loop to go from 2 to the number of rows (nrow) yet reference i+1.

When i=nrow, you're asking the loop to go past the number of rows, which means your out of bounds.

Whenever you see this error you check your boundary conditions.

Perhaps your loop should go from i=1 to nrow(DM)-1 instead?

Rick_SAS — Fri, 10 Jan 2014 19:53:21 GMT

Yes. The message tells you that the MONSET vector has 141 rows and you are trying to access element 142.