CODEWITHSUNDEEP
stringrextract
hejseb
hejseb

Reputation: 2164

Extract part of string

I've been trying to extract something from a string (actually a $call) in R, and it's driving me nuts. If you have:

library(vars)
data <- as.data.frame(matrix(c(runif(40)), ncol=2))
z <- matrix(c(runif(40)), ncol=2)
var.modell <- VAR(data, p = 2, exogen=z, type = "trend")

How do you extract the z? I've tried googling and searching stack overflow. I found this: R extract a part of a string in R

which made me try:

sub(".*?exogen=(.*?)", "\\1", var.modell$call, perl = TRUE)

But it returns:

[1] "VAR"   "data"  "2"     "trend" "z"

What am I doing wrong?

Upvotes: 1

Views: 319

Answers (1)

Matthew Lundberg
Matthew Lundberg

Reputation: 42649

Look at the call object itself:

m <- lm(speed~dist,data=cars)
m$call$data
## cars

You'll want var.modell$call$exogen.

Upvotes: 3

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