Hello Guys
I am new at writing Functions in R, and as a result am struggling with it.
I am trying to use Google & other resources, but it's hard to find
solutions when you don't know what to look for.
I have the following small dataset
> dput(sub)
structure(list(week = c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28,
29, 30), value = c(9.45, 7.99, 9.29, 11.66, 12.16, 10.18, 8.04,
11.46, 9.2, 10.34, 9.03, 11.47, 10.51, 9.4, 10.08, 9.37, 10.62,
10.31, 10, 13, 10.9, 9.33, 12.29, 11.5, 10.6, 11.08, 10.38, 11.62,
11.31, 10.52)), .Names = c("week", "value"), row.names = c(NA,
-30L), class = "data.frame")
I want to take each of the value and subtract from a target {in this case
its 10}. This is what I have written in my function so far:
vmask <- function(data,target){
for(k in 1:length(data))
deviation <- data[k]- target
dev <- return(data.frame(cbind(data,deviation)))
return(dev)
}
vmask(sub,10)
View(dev)
But when I run this I get the results as expected. But I expected the new
coloumn to be called "deviation", whereas R just calls in "value.1". How
can I fix this?
Also I was hoping to see this new dataset with columns "week", "value",
and now "deviation" when I use "View(dev) - but it comes up with error
'dev not found'. How can i fix this? Also is there anyway instead of me
making a new dataset called "dev" with the 3 columns, I can just re-use my
original dataset "sub" and give me all the 3 new columns?
The next step I want to do is to perform a cumulative sum. So looking at
the results, I want a new coloumn in existing dataset (or new dataset),
which will now have 4 columns. The 4th column I want to be called "CuSum".
So the first row of Cusum will be "-0.55", the second = "-0.55+(-2.01)"
which will give me "-2.56" and so on forth.
How can I do this in R using a function? Please help
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