r - Cannot use `fill = NA` in cast -

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i received following error:

dcast(rep.data, country ~ variable, mean, fill=na)  error in vapply(indices, fun, .default) : values must type 'logical', fun(x[[4]]) result type 'double'

here rep.data data frame above:

structure(list(id = c("mrt1996", "bfa1982", "lbr1990", "ukr2000",  "mng1993", "ven1992", "omn1987", "lao1996", "omn1982", "syr1993" ), wbcode = c("mrt", "bfa", "lbr", "ukr", "mng", "ven", "omn",  "lao", "omn", "syr"), polcode = c("maa", "bfo", "lbr", "ukr",  "mon", "ven", "oma", "lao", "oma", "syr"), country = c("mauritania",  "burkina faso", "liberia", "ukraine", "mongolia", "venezuela, rb",  "oman", "lao pdr", "oman", "syrian arab republic"), cid = c(117l,  14l, 96l, 174l, 115l, 179l, 130l, 94l, 130l, 161l), year = c(1996l,  1982l, 1990l, 2000l, 1993l, 1992l, 1987l, 1996l, 1982l, 1993l ), variable = structure(c(9l, 7l, 22l, 26l, 18l, 24l, 10l, 7l,  16l, 25l), .label = c("fdi", "gdp", "l.gdp", "gdp.pc", "l.gdp.pc",  "growth", "govex", "deficit", "r.usa", "polity", "polpersist",  "varpol.5", "bonds", "eqty", "net.port.in", "portin.gdp", "external.debt",  "external.debt.gdp", "official.xr.pct", "inflation.deflt", "iir.annual",  "default", "cum.default.60", "pct.default.60", "cum.default.80",  "pct.default.80", "tor80s", "tor90s", "events", "tor5", "turn" ), class = "factor"), value = c(6.2, 15.56, 1, 14.29, 74.04,  27.27, 0, 7.92, 0, 0)), .names = c("id", "wbcode", "polcode",  "country", "cid", "year", "variable", "value"), row.names = c(26927l,  18978l, 67240l, 81096l, 55030l, 74901l, 30322l, 20280l, 49085l,  77731l), class = "data.frame")

use na_real_ instead of na, since dcast matches type well.


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