Submitting R statements is similar to submitting SAS statements. You use a SUBMIT statement, but add the R option: SUBMIT / R. All statements in the program prior to the next ENDSUBMIT statement are sent to R for execution.
The simplest program that calls R is one that does not transfer any data between the two environments. In the following program, SAS/IML is used to compute the product of a matrix and a vector. The result is printed. Then the SUBMIT statement with the R option is used to send an equivalent set of statements to R.
/* Comparison of matrix operations in IML and R */
print "---------- SAS/IML Results -----------------";
x = 1:3; /* vector of sequence 1,2,3 */
m = {1 2 3, 4 5 6, 7 8 9}; /* 3x3 matrix */
q = m * t(x); /* matrix multiplication */
print q;
print "------------- R Results --------------------";
submit / R;
rx <- matrix( 1:3, nrow=1) # vector of sequence 1,2,3
rm <- matrix( 1:9, nrow=3, byrow=TRUE) # 3x3 matrix
rq <- rm %*% t(rx) # matrix multiplication
print(rq)
endsubmit;
---------- SAS/IML Results -----------------
q
14
32
50
------------- R Results --------------------
[,1]
[1,] 14
[2,] 32
[3,] 50
The printed output from R is automatically routed to the SAS/IML Studio output window, as shown in Figure 11.1. As expected, the result of the computation is the same in R as in SAS/IML.