Came across a clear and short description of the "apply" function series
from Roger Peng @ UCLA. Nicely done, very powerful and caused me to
have a mini-eureka moment that a lot of other material didn't trigger.
Probably mis-firing synapses or is it the liberal arts education???
http://www.ats.ucla.edu/stat/R/library/advanced_function_r.htm
or
http://tinyurl.com/5vakd
http://www.ats.ucla.edu/stat/R/library/
or
http://tinyurl.com/47awq
HTH,
Vince