[R] loop issues (r.squared)

andy1983 andy1983 at excite.com
Thu Feb 8 21:28:39 CET 2007

I would like to compare every column in my matrix with every other column and
get the r-squared. I have been using the following formula and loops:
where x and y are the looping column numbers

If I have 100 columns (10,000 iterations), the loops give me results in a
reasonable time.
If I try 10,000 columns, the loops take forever even if there is no formula
inside. I am guessing I can vectorize my code so that I could eliminate one
or both loops. Unfortunately, I can't figure out how to.

Any suggestions?

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