R help - Jun 2005 - Data.frames with different line's length

Hello,

I want to create a data.frame with different number of columns per line. What I
want is something like:

example <- NULL
begin <- 1
while (end < nrow(orig.data))
{
end <- next.day(orig.data,begin) # my own function. It returns the first
index from the next day. Each day has a different number of records.
example <- rbind(example, c(begin, end, predictions[c(begin:end)], ...))
begin <- end+1
}

It gives the following warning:
> number of columns of result
        not a multiple of vector length (arg 2) in: rbind(example, c(begin, end,
predictions[c(begin:end)], ...

I believe this happen once the number of elements by line are different. The
example data.frame repeats the same values for shorter lines until the line is
full, i.e., it tries to create lines with the same number of columns.

The question is: How can I create a data.frame with different number of columns?

Any help is very much appreciated

Thanks in advance

Joao Moreira
	[[alternative HTML version deleted]]

Hi

from help page

Details:

     A data frame is a list of variables of the same length with unique
						^^^^^^^^^^
     row names, given class '"data.frame"'.

So you need to use a different sructure (e.g.list) or you have to 
ensure that you rbind vectors of same length.

HTH
Petr


On 21 Jun 2005 at 12:09, Jo??o Mendes Moreira wrote:
> Hello,
> 
> I want to create a data.frame with different number of columns per
> line. What I want is something like:
> 
> example <- NULL
> begin <- 1
> while (end < nrow(orig.data))
> {
> end <- next.day(orig.data,begin) # my own function. It returns the
> first index from the next day. Each day has a different number of
> records. example <- rbind(example, c(begin, end,
> predictions[c(begin:end)], ...)) begin <- end+1 }
> 
> It gives the following warning:
> 
> > number of columns of result
>         not a multiple of vector length (arg 2) in: rbind(example,
>         c(begin, end, predictions[c(begin:end)], ...
> 
> I believe this happen once the number of elements by line are
> different. The example data.frame repeats the same values for shorter
> lines until the line is full, i.e., it tries to create lines with the
> same number of columns.
> 
> The question is: How can I create a data.frame with different number
> of columns?
> 
> Any help is very much appreciated
> 
> Thanks in advance
> 
> Joao Moreira
>  [[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at 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
Petr Pikal
petr.pikal at precheza.cz