[R] Question about Reduce

[Dimitri Liakhovitski]

Hello!

In the example below the Reduce() function by default assigns "a" to
be the last accumulated value and "b" to be the current value in "x".
I could not find this documented anywhere as the default settings for
the Reduce() function.  Does any sort of documentation for this
behavior exist?

x <-  c(0,0,0,0,0,1,0,0,0,5,0,0,0,7,0,0,0,8,5,10)
Reduce(function(a,b) b + (a * 0.5),x,accumulate=T,init=0)

 [1]  0.0000000  0.0000000  0.0000000  0.0000000  0.0000000  0.0000000
 1.0000000  0.5000000  0.2500000
[10]  0.1250000  5.0625000  2.5312500  1.2656250  0.6328125  7.3164062
 3.6582031  1.8291016  0.9145508
[19]  8.4572754  9.2286377 14.6143188


Thanks a lot!

-- 
Dimitri Liakhovitski
Ninah Consulting
www.ninah.com