r - Row division for even number rows -

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i trying divide first row second, third row fourth , fifth row sixth , onward large data table. there way without computation.

input 

name month income john jan 10000  john_county jan 20000  tanya jan 20000  tanya_county jan 40000

output

name month per_income john jan 50% tanya jan 50%

in r can use , odd index:

odds <- c(true, false) ii[odds,"per_income"] <- paste0(ii[odds,3] / ii[!odds,3] * 100,"%") ii[odds,] #    name month income per_income # 1  john   jan  10000        50% # 3 tanya   jan  20000        50%

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