R: ifelse statement to create new variable equal to value of second variable conditional on value of third variable -

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i'm trying create new variable (nphours) value of value of second variable (hours) conditioned on value of third variable (prod) being equal "n", otherwise want value of (nphours) "0".

sample data:

samp<-structure(list(hours = c(4.05, 4.05, 3.95, 3.95, 1), prod = structure(c(2l,  1l, 2l, 1l, 1l), .label = c("n ", "y "), class = "factor"), nphours = c("0",  "0", "0", "0", "0")), .names = c("hours", "prod", "nphours"), row.names = c(na,  5l), class = "data.frame")

the following ifelse statement produces "0".

samp$nphours <- ifelse(samp$prod == "n", samp$hours, 0)

can assist?

str(samp$prod)

so...report blank after "n" ....

samp$nphours <- ifelse(samp$prod == "n ", samp$hours, 0)

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