under what circumstances does R recycle? -


i have 2 variables, x (takes in 5 values) , y (takes in 11 values). when want run argument,

> v <- 2*x +y +1

r responds:

error @ 2* x+y: longer object length not multiple of shorter object length.

i tried: 1*x gives me 5 values of x, y has 11 values. r says can’t add 11 5 values? – raises general question: under circumstances recycling work?

recycling works in example:

> x <- seq(5) > y <- seq(11) > x+y  [1]  2  4  6  8 10  7  9 11 13 15 12 warning message: in x + y : longer object length not multiple of shorter object length > v <- 2*x +y +1  warning message: in 2 * x + y :   longer object length not multiple of shorter object length > v  [1]  4  7 10 13 16  9 12 15 18 21 14

the "error" reported in fact "warning" means r notifying recycling recycles anyway. may have options(warn=2) turned on, converts warnings error messages.

in general, avoid relying on recycling. if in habit of ignoring warnings, day bite , code fail in hard diagnose way.


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