Calculates vector of ratios of a numeric vector, i.e. ratio of x[2] to x[1], ratio of x[3] to x[2], and so forth.
1  ratios(x)

x 
Numeric vector. 
Numeric vector.
This function uses C++ code to achieve a 1.52 times speed increase compared to the base R code: len < length(prices); prices[2: len] / prices[1: (len  1)].
Dane R. Van Domelen
Acknowledgment: This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE0940903.
diffs
, pdiffs
, pchanges
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