On Wed, 10 Jun 2009, matifou wrote:
ehxpieterse wrote:
Hi,
I am quite new to R and would appreciate some guidance, if possible.
I have imported a csv file: spread <- read.csv("Spread.csv")
I get the following error when I try to run adf.test:
adf.test(spread,alternative = c("stationary", "explosive"),0)
Error in embed(y, k) : 'x' is not a vector or matrix
Why is this?
What does class(spread) give?
"data.frame", almost certainly, which is not a vector or a matrix. The
original poster should access the relevant column, e.g. by spread[,1] or
spread$foo etc. or (even better) turn it into a proper "ts" object!
You should try as.vector(spread) and see what happens
If spread is a 1-column data.frame, then that won't change anything.
That's because is.vector(as.vector(...)) is not necessarily TRUE. Consider
x <- cars[, 1, drop=FALSE]
is.vector(x)
is.vector(as.vector(x))
identical(x, as.vector(x))
Z
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