simple question on data frames assignment
Thaks so much! And how would you incorporate lapply() here?
On Thu, Apr 7, 2016 at 6:52 AM, David Barron <dnbarron at gmail.com> wrote:
ifelse is vectorised, so just use that without the loop. colordata$response <- ifelse(colordata$color == 'blue', 1, 0) David On 7 April 2016 at 12:41, Michael Artz <michaeleartz at gmail.com> wrote:
Hi I'm not sure how to ask this, but its a very easy question to answer
for
an R person.
What is an easy way to check for a column value and then assigne a new
column a value based on that old column value?
For example, Im doing
colordata <- data.frame(id = c(1,2,3,4,5), color = c("blue", "red",
"green", "blue", "orange"))
for (i in 1:nrow(colordata)){
colordata$response[i] <- ifelse(colordata[i,"color"] == "blue", 1, 0)
}
which works, but I don't want to use the for loop I want to "vecotrize"
this. How would this be implemented?
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