[R] str and structable error
Hallo I encountered a behaviour which puzzles me (but finally I did get what I wanted). I used structable and strucplot but I wanted to change names of variables in structable object. I tried to subset it, use names but to no avail. So I tried str and expected to get a structure of an object but: sss-structable(Titanic) str(sss) Error in [.structable(x, args[[1]], ) : subscript out of bounds Finally I learned, that I need to change attributes of structable object. Is this error message OK and I did not read documentation properly? Or is it normal that str gives an error on some objects but I just was not so lucky to meet one?. W2000, R2.2.0, vcd package Built: R 2.2.0; ; 2005-11- 22 14:23:44; windows, Best regards. Petr Petr Pikal [EMAIL PROTECTED] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] str and structable error
Petr Pikal wrote: Hallo I encountered a behaviour which puzzles me (but finally I did get what I wanted). I used structable and strucplot but I wanted to change names of variables in structable object. I tried to subset it, use names but to no avail. So I tried str and expected to get a structure of an object but: sss-structable(Titanic) str(sss) Error in [.structable(x, args[[1]], ) : subscript out of bounds Looks like package vcd needs a separate structable method for the str() generic. Uwe Ligges Finally I learned, that I need to change attributes of structable object. Is this error message OK and I did not read documentation properly? Or is it normal that str gives an error on some objects but I just was not so lucky to meet one?. W2000, R2.2.0, vcd package Built: R 2.2.0; ; 2005-11- 22 14:23:44; windows, Best regards. Petr Petr Pikal [EMAIL PROTECTED] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
Re: [R] str and structable error
Petr == Petr Pikal [EMAIL PROTECTED]
on Mon, 28 Nov 2005 08:38:07 +0100 writes:
Petr Hallo I encountered a behaviour which puzzles me (but
Petr finally I did get what I wanted).
Petr I used structable and strucplot but I wanted to change
Petr names of variables in structable object.
structable is not part of R :
You should tell us that you are using an extra package where
structable is from : namely -- I did your homework -- vcd
Petr I tried to subset it, use names but to no avail. So I
Petr tried str and expected to get a structure of an object
Petr but:
sss-structable(Titanic)
str(sss)
Petr Error in [.structable(x, args[[1]], ) : subscript
Petr out of bounds
yes, and similar problems from
library(vcd)
example(structable)
str(hec)
-- see below
Petr Finally I learned, that I need to change attributes of
Petr structable object.
Petr Is this error message OK and I did not read
Petr documentation properly? Or is it normal that str gives
Petr an error on some objects but I just was not so lucky
Petr to meet one?.
No, it is not normal (and is a bug -- in vcd code IMO):
The reason is that structable ``objects'' (S3)
do not fulfill a fundamental property that all S (and hence R)
objects should fulfill IMO {but read on before protesting}
length() and [ should be compatible
-
namely, for an object 'x', if
n - length(x)
and assume n 0 for the moment,
then
x[j]
should return something reasonable for all numeric vectors 'j'
which have values in {1,2,...,n} (and also for {-n,...,-1})
This is unfortunately not at all true for structable objects.
I'd say the authors of structable made a bit a peculiar
decision when they designed the [.structable method since that
invalidates the above basic principle.
This is particularly unfortunate, since structable also
inherits from ftable {a ``standard R'' S3 class} which does
not have that bad property
If the current [ (non-S-like IMO) behavior of structable
objects really will be maintained in the future,
one solution / workaround would be to define a simple
str.structable method -- which would also help you for the
moment :
str.structable - function(object, ...) {
cat(structable )
class(object) - class(object)[-1]
str(object, ...)
}
str(structable(Titanic))
structable ftable [1:8, 1:4] 0 118 0 154 35 387 0 670 5 57 ...
- attr(*, dnames)=List of 4
..$ Class : chr [1:4] 1st 2nd 3rd Crew
..$ Sex : chr [1:2] Male Female
..$ Age : chr [1:2] Child Adult
..$ Survived: chr [1:2] No Yes
- attr(*, split_vertical)= logi [1:4] FALSE TRUE FALSE TRUE
- attr(*, col.vars)=List of 2
..$ Sex : chr [1:2] Male Female
..$ Survived: chr [1:2] No Yes
- attr(*, row.vars)=List of 2
..$ Class: chr [1:4] 1st 2nd 3rd Crew
..$ Age : chr [1:2] Child Adult
- attr(*, class)= chr ftable
Regards,
Martin Maechler, ETH Zurich
Petr W2000, R2.2.0, vcd package Built: R 2.2.0; ; 2005-11-
Petr 22 14:23:44; windows,
Petr Best regards.
Petr Petr
Petr Petr Pikal [EMAIL PROTECTED]
__
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https://stat.ethz.ch/mailman/listinfo/r-help
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Re: [R] str and structable error
I encountered a behaviour which puzzles me (but finally I did get what I wanted). I used structable and strucplot but I wanted to change names of variables in structable object. I tried to subset it, use names but to no avail. So I tried str and expected to get a structure of an object but: sss-structable(Titanic) str(sss) Error in [.structable(x, args[[1]], ) : subscript out of bounds Looks like package vcd needs a separate structable method for the str() generic. yes! Thanks for pointing this out. It's because [.structable has a non-standard behavior. Using: [.structable = function(object, ...) NextMethod() at the command line, str() would work as expected. David Uwe Ligges Finally I learned, that I need to change attributes of structable object. Is this error message OK and I did not read documentation properly? Or is it normal that str gives an error on some objects but I just was not so lucky to meet one?. W2000, R2.2.0, vcd package Built: R 2.2.0; ; 2005-11- 22 14:23:44; windows, Best regards. Petr Petr Pikal [EMAIL PROTECTED] __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html -- Dr. David Meyer Department of Information Systems and Operations Vienna University of Economics and Business Administration Augasse 2-6, A-1090 Wien, Austria, Europe Fax: +43-1-313 36x746 Tel: +43-1-313 36x4393 HP: http://wi.wu-wien.ac.at/~meyer/ __ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
