proc iml;
a = {1 2, 3 4};
c= {1 0, 0 1};
b = a || c;
d = echelon(b);
x1 = d[1,3];
x2= d[1,4] ;
x3 = d[2,3];
x4 = d[2,4];
e = {0 0, 0 0};
e[1,1] = x1;
e[1,2] = x2;
e[2,1]= x3;
e[2,2]= x4;
print d, e;
Is the and easier way to put grab the take the 2x2 matrix out of the 2 by 4 matrix?
See the section here on "extracting rows and columns".
http://support.sas.com/publishing/pubcat/chaps/63119.pdf
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