[R] Cannot get simple data.frame binding.

[John Kane]

--- Gabor Grothendieck <ggrothendieck at gmail.com>
wrote:

> The error message says that md1 and other have
> different
> number of rows.   Please read the last line of every
> message
> to r-help.

My appologies, I forgot to include that infomation. 
As far as I can tell 'md1' is a data.frame of
dimensions ( 75 rows ,19 columns) and 'other' is a
numeric vector of length 75.   I have tried to
duplicate the dataframe and vector in the example.  

I assume that I am missing something obvious since I
can create the new dataframe in a more labourious
manner but not with an indexed command.


> 
> On 8/28/06, John Kane <jrkrideau at yahoo.ca> wrote:
> > I am stuck on a simple problem where an example
> works
> > fine but the real one does not.
> >
> > I have a data.frame where I wish to sum up some
> values
> > across the rows and create a new data.frame with
> some
> > of old data.frame variables and the new summed
> > variable.
> >
> > It works fine in my simple example but I am doing
> > something wrong in the real world.  In the real
> world
> > I am loading a labeled data.frame. The orginal
> data
> > comes from a spss file imported using spss.get but
> the
> > current data.frame is a subset of the orginal spss
> > file.
> >
> > EXAMPLE
> > cata <- c( 1,1,6,1,1,NA)
> > catb <- c( 1,2,3,4,5,6)
> > doga <- c(3,5,3,6,4, 0)
> > dogb <- c(2,4,6,8,10, 12)
> > rata <- c (NA, 9, 9, 8, 9, 8)
> > ratb <- c( 1,2,3,4,5,6)
> > bata <- c( 12, 42,NA, 45, 32, 54)
> > batb <- c( 13, 15, 17,19,21,23)
> > id <- c('a', 'b', 'b', 'c', 'a', 'b')
> > site <- c(1,1,4,4,1,4)
> > mat1 <-  cbind(cata, catb, doga, dogb, rata, ratb,
> > bata, batb)
> >
> > data1 <- data.frame(site, id, mat1)
> > attach(data1)
> > data1
> > aa <- which(names(data1)=="rata")
> > bb <- length(names(data1))
> >
> > mat1 <- as.matrix(data1[,aa:bb])
> > food <- apply( mat1, 1, sum , na.rm=T)
> > food
> >
> > abba <- data.frame(data1[, 1:6], food)
> > abba
> >
> > ----------------------------------
> > Real life problem
> >
> >
>
>load("C:/start/R.objects/partly.corrected.materials.Rdata")
> > > md1<-partly.corrected.materials
> > > aa <- which(names(md1)=="oaks")
> > > bb <- length(names(md1))
> > >
> > > # sum the values of the "other" variables
> > > mat1 <- as.matrix( md1[, aa:bb] )
> > > other <- apply(mat1,1, sum, na.rm=T)
> > > ire1 <- data.frame(md1[, 1:11], other)
> > Error in data.frame(md1[, 1:11], other) :
> arguments
> > imply differing number of rows: 11, 75
> >
> > ---------------------------------------------
> >
> > I have simply worked around the problem by using
> > ire1 <- data.frame(md1$site, md1$colour, md1$ss1
> ... ,
> > other)
> > but I would like to know what stupid thing I am
> doing.
> >
> > Thanks
> >
> > ______________________________________________
> > 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
> > and provide commented, minimal, self-contained,
> reproducible code.
> >
>