Jonas Stein <news <at> jonasstein.de> writes:
>
> Hi,
>
> i would like to plot a few hundred .csv files.
> Each file contains one curve with x,y values to plot.
>
> I have been searching for "gnu r read many files qplot"
> and similar words. I found for loops that use assign to generate
> one variable containing a dataframe.
>
> When i uesed the classic "plot' command i could add
> the curves with something like
>
> for... {
> data<-read.csv....
> points(data$x, data$y, col=myrainbow, type="l")
> }
>
> How would you solve it in ggplot?
>
> Kind regards,
>
I would use something along the lines of
L <- lapply(list.files(pattern),read.csv)
to read the files into a list.
Something like
L2 <- mapply(function(i,x) {
data.frame(file=i,x) },seq_along(L),L)
to add an index column to each data frame
L3 <- do.call(rbind,L2)
to combine them all into a single data frame
and
ggplot(L3,aes(x=x,y=y,group=file))+geom_line()
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