Using str() in a function.
I am in the early phase of learning R, and I find I spend a lot of time
trying to figure out what is actually in objects I have created or read in
from a file. I'm trying to make a simple little function to display a
couple of things about a object, let's say the summary() and the str(),
sequentially, preferably without a bunch of surplus lines between them. I
have tried a large number of things; none do what I want.
> GG<- c(1,2,3)
# This one ignores the str().
> testX <- function(X) {return(summary(X)); str(X)}
> testX(GG)
Min. 1st Qu. Median Mean 3rd Qu. Max.
1.0 1.5 2.0 2.0 2.5 3.0
# So does this one.
> testX2 <- function(X) {return(summary(X)); return(str(X))}
> testX2(GG)
Min. 1st Qu. Median Mean 3rd Qu. Max.
1.0 1.5 2.0 2.0 2.5 3.0
# On the other hand, this one ignores the summary()
> testX3 <- function(X) {summary(X); return(str(X))}
> testX3(GG)
num [1:3] 1 2 3
# This one displays both, in reverse order, with a superfluous (to my
intentions) [[NULL]].
> testX4 <- function(X) {list(summary(X), (str(X)))}
> testX4(GG)
num [1:3] 1 2 3
[[1]]
Min. 1st Qu. Median Mean 3rd Qu. Max.
1.0 1.5 2.0 2.0 2.5 3.0
[[2]]
NULL
# Now we are back to ignoring the str().
> testX5 <- function(X) {list(return(summary(X)), (str(X)))}
> testX5(GG)
Min. 1st Qu. Median Mean 3rd Qu. Max.
1.0 1.5 2.0 2.0 2.5 3.0
# This does the same as testX4().
> testX6 <- function(X) {return(list(summary(X), (str(X))))}
> testX6(GG)
num [1:3] 1 2 3
[[1]]
Min. 1st Qu. Median Mean 3rd Qu. Max.
1.0 1.5 2.0 2.0 2.5 3.0
[[2]]
NULL
I tried a bunch more, using the print command, etc., but nothng I tried
resulted in the output of summary() followed by the output of str(). And is
there really no way to assign the output of str() -- that is to say, the
output str() normally prints to the console -- to an object?
I would be very greatful for any guidance you could offer.
Sincerely, Andrew
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