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How to perform group calculations on all the cells in a column in R
I have been looking all over the Internet, and asking around on SO for a way to perform a group calculation in all the cells in one column.
Here is what I tried and got:
f <- 1:4
s <- 1:2
e <- 1:2
df <- data.frame(id = c(rep("a", 4), rep("b", 4)), value = c(f, f, s, s, e, e, s, s))
df$factor <- ifelse(df$value == f | df$value == s, 'a', 'b')
df$group.calc <- ifelse(df$value == e, 1, 0) * ncol(df$id)
I am looking for a dataframe with id and factor as columns, with group.calc as a value to be performed on all the cells in the column, and id as a grouping factor.
The result should be:
id factor group.calc
a f 1
a f 2
a s 4
a s 8
a e 32
b f 1
b f 2
b s 4
b s 8
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