1. Appendix D: SAS PROC IML
Matrix Language with Interface to all SAS capacities and functionality
Use it as a calculator
Use it to write your own programs
Full Documentation at

2. PROC IML Overview Invoke SAS from your machine, and type in proc iml ;
Then click on the Run button. You are now ready to run the SAS matrix language. To input the 4 by 2 matrix X, enter
X = { 1 2,
3 4,
5 6,
7 9 } ;
Using curly brackets with space to delimit columns and a comma to delimit rows.

3. PROC IML Operators
Transpose ` (key above the ~ on US English keyboards)
Addition +
Subtraction -
Matrix Multiply *
Scalar Multiplication *
Inverse of matrix INV(matrix)
Diagonal of matrix DIAG(matrix)
Square Root of elements SQRT(matrix)
Elementwise Division /

4. PROC IML Matrix Subsets
Subscript [row(s), col(s) ]
Pick off jth col of A A[,j]
Sum across columns A[,+]
Subset A A[{1 3 2}, {1}]
The last example takes rows 1, 3 and 2 and column 1 from A.