[R] vector angle

Evan Zane Macosko macosko at fas.harvard.edu
Tue Jul 17 06:40:30 CEST 2001

Hi everyone,

I'm translating into R some programs I worked through in Matlab to
calculate the angle between two vectors (very large--like 6200 rows in
each vector).  In Matlab, I used a series of nested for loops, because I
was calculating the angles between many pairs of vectors.  I know for
loops are not desirable in R code, so I was wondering if anyone could
recommend a faster way to complete this task.  Also, I have NAs in my
vectors--I've had trouble performing various operations on my vectors in R
because of these NAs.

Any advice on this would be greatly appreciated.

Evan Macosko

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