Hi,
I need to calculate the difference between a row vectror and a column vector in a matrix. For example:
vr = {10 15}
vc = {5 10}
m = {5 10,
0 5}
m = is the difference between them. m[1.1] = vr[1] - vc[1], m[1,2] = vr[2] - vc[1] etc.
Currently I am doing this using a loop. Is there a way to accomplish this using vector/matrix notation?
Thanks,
Eyal
The repeat function is one way of doing this. For example:
proc iml;
vr = {10 15};
vc = {5, 10};
m=repeat(vr,2,1)-repeat(vc,1,2);
print m;
quit;
where 2 is the length of both vectors. Note that in your example vc is not a column vector, so I have added a comma above.
Hope that helps.
Ian has the right idea, although you only need to use the REPEAT function once:
vr = {10 15};
vc = {5 10};
v = repeat(vr, ncol(vc)); /* repeat vector to create matrix */
m = v - vc`; /* subtract i_th element from i_th row */
print m;
For details, see this article on "Shorthand notation for row and column operations."
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