r - Variable name collision in dplyr -


i attempting compute moving median on variable contained within data.frame using dplyr. problem running function passing rollapply() has same name variable in original data.frame. example:

df <- data.frame(median = seq(1:100))  df %>%   mutate(ln_median = log(median)) %>%   mutate(ln_median_10 = rollapply(ln_median, 5, median))

generates error message:

error in eval(substitute(expr), envir, enclos) : '1:100' not function, character or symbol

the underlying cause median in rollapply() resolving variable in data.frame , not function "median". have been able around following code:

df %>% mutate(ln_median = log(median)) %>%        mutate(ln_median_10 = rollapply(ln_median, 5, function(a) median(a), fill = na))

that is, wrapping median function in order suppress being interpreted variable within data.frame.

is there more elegant way of achieving same thing?

have tried pass function name in as

stats::median

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