syntax - R - How do I reference a variable by the column position? -


i have matrix / data frame of bunch of variables. how reference when setting formula?

example: let's have data set as:

data = read.csv(data_location, sep = ',')

and since it's high dimensionality don't spell out each column (which otherwise use c(col)). on lower dimensionality content i'd spell out each content. it's called target, left data[50].

fit <- rpart(target ~ ., data = train1, method = "anova")

i can't say

fit <- rpart(data[50] ~ ., data = train1, method = "anova")

as says "invalid type (list) variable 'data[50]'. how reference proper syntax?

data[, 50] should work since data[50] return data.frame (list) instead of contents of data.frame, need. try class(data[50]) , class(data[, 50]) see difference.


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