Subscripts

[acordes]

Having a matrix X with say 100 rows and 10 columns I want to subset the matrix X2 by selecting rows 1 to 5 and rows 20 to 30.

PROC IML;

X=J(100,10,.);

CALL RANUNI(12345,X);

X2=X[1:5,]; /*WORKS*/

X2=X[{1:5 20:30},]; /*DOES NOT WORKS*/

[IanWakeling · Accepted solution]

you need to concatenate the two ranges together using '||'

X2=X[(1:5)||(20:30),];

[acordes]

Thanks @IanWakeling. I was behind the || operator but I haven't used it correctly in terms of the brackets. 

[Rick_SAS]

For more on extracting submatrices, see "Extracting elements from a matrix: rows, columns, submatrices, and indices"