Hi
r-help-boun...@r-project.org napsal dne 06.07.2009 01:58:38:
> On Sun, Jul 5, 2009 at 1:44 PM, hadley wickham<h.wick...@gmail.com>
wrote:
> >> I think the root cause of a number of my coding problems in R right
> >> now is my lack of skills in reading and grabbing portions of the data
> >> out of arrays. I'm new at this. (And not a programmer) I need to find
> >> some good examples to read and test on that subject. If I could
locate
> >> which column was called C1, then read row 3 from C1 up to the last
> >> value before a 0, I'd have proper data to plot for one line. Repeat
as
> >> necessary through the array and I get all the lines. Doing the lines
> >> one at a time should allow me the opportunity to apply color or not
> >> plot based on values in the first few columns.
> >>
> >> Thanks,
> >> Mark
> >>
> >> test <- data.frame(A=1:10, B=100, C1=runif(10), C2=runif(10),
> >> C3=runif(10), C4=runif(10), C5=runif(10), C6=runif(10))
> >> test<-round(test,2)
> >>
> >> #Make array ragged
> >> test$C3[2]<-0;test$C4[2]<-0;test$C5[2]<-0;test$C6[2]<-0
> >> test$C4[3]<-0;test$C5[3]<-0;test$C6[3]<-0
> >> test$C6[7]<-0
> >> test$C4[8]<-0;test$C5[8]<-0;test$C6[8]<-0
> >>
> >> #Print array
> >> test
> >
> > Are the zeros always going to be arranged like this? i.e. for
> > experiment there is a point at which all later values are zero? If
> > so, the following is a much simpler way of getting to the core of your
> > data, without fussing with overly complicated matrix indexing:
> >
> > library(reshape)
> > testm <- melt(test, id = c("A", "B"))
> > subset(testm, value > 0)
> >
> > I suspect you will also find this form easier to plot and analyse.
> >
> > Hadley
> >
> > --
> > http://had.co.nz/
> >
>
> Hi Hadley,
> I wanted to look at reshape.
>
> Yes, there exists a point in each row (unless I get to the end with
> all numbers) where I get to a zero and everything to the right is
> zero.
>
> I'm looking at ReShape. It's interesting but I clearly don't
> understand it yet so I'm reading your ReShaping data with the reshap
> package form 11/07. Interesting.
>
> I know so little about R that I'm sort of drowning at this point
> that it's hard for me to understand why this would make plotting
> easier. Analysis possibly. Just the way it goes when you get started
> with something new.
E.g. to give different colour according to C1-C6 and/or different shape
for each A value.
test. <- subset(testm, value > 0)
plot(test.$value, col=as.numeric(test.$variable), pch=test.$A)
And even fancier plots with ggplot2 package.
Regards
Petr
>
> In ReShape lingo I think I have ID's. They cover things like time,
> date, success/failure and a few other things of interest. Once the
> data starts on a row it is all data from there on to the end of the
> row.
>
> My initial goal is to make a line plot of the data on a single row.
> All the data points should connect together. There is no real
> interaction planned with data on other rows, at least at this time.
>
> Thanks for the pointers and the code stub. I'll be looking at this.
>
> Cheers,
> Mark
>
> ______________________________________________
> R-help@r-project.org 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.
______________________________________________
R-help@r-project.org 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.
