This is one of those times when you would do better to just use a loop. It will
be easier to debug and to see what is going on. Replace the sapply() call with
for (i in 1:length(ind)) {
postscript(names(ind[i]))
par(mar=c(6,8,6,5), cex=0.8)
plot(ind[[i]][,c('YEAR','VALUE')],
type='b',
main = ind[[i]][1, "NAME"],
. . . other commands . . . )
dev.off()
}
-------------------------------------
David L Carlson
Department of Anthropology
Texas A&M University
College Station, TX 77840-4352
-----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of fd
Sent: Thursday, July 31, 2014 9:37 AM
To: r-help@r-project.org
Subject: [R] Multiple plots and postscripts using split function
Hi,
I'm relatively new to R and I would like to do the following:
I have a .csv file with four columns (NAME, ID, YEAR, VALUE) and would like
to do several xy plots with the year on the x-axis and the data values
(measurements) on the y-axis and after that export the different plots to
postcript.
My .csv file looks something like this (only an example):
NAME ID YEAR VALUE
ADAMS 885 1988 -2
ADAMS 885 1989 0
BAHIA DEL DIABLO 2665 1999 4
BAHIA DEL DIABLO 2665 2000 8
BAHIA DEL DIABLO 2665 2001 19
BAHIA DEL DIABLO 2665 2002 13
BAHIA DEL DIABLO 2665 2003 13
BARTLEY 893 1983 0
BARTLEY 893 1984 -1
BARTLEY 893 1985 0
BARTLEY 893 1988 2
BARTLEY 893 1989 -1
CANADA 877 1972 -1
I have split the different items into groups and I'd like the plots to have
the title of NAME but the filename of the postscript to be exported should
have the ID as filename.
My code so far:
#Set Working Directory:
setwd("/Users/Desktop/FV")
# Read CSV
dat <- read.csv("FV.csv", sep=";", header=TRUE)
# Split Data
ind <- split(x = dat,f = dat[,'ID'])
nam <- names(ind)
sapply(nam, function(x) {
postscript(x)
par(mar=c(6,8,6,5), cex=0.8)
plot(ind[[x]][,c('YEAR','VALUE')],
type='b',
main = x,
xlab="Time [Years]",
ylab="Front variation")
axis(1, at = seq(1800,2100,5), cex.axis=1, labels=FALSE, tcl=-0.3)
axis(2, at = seq(-100000,100000,500), cex.axis=1, labels=FALSE,
tcl=-0.3)
dev.off()
})
This results in plots with the title and filename of the resulting
postscript being the same. Is there a way to get the plot title out of the
NAME column and the filename out of the ID?
Additionally I'd only like to plot graphs for items with more than 3 data
values. Is this possible to incorporate in the split command?
Another point is that some items have gaps in the time series where no
measurements were taken (in my example: BARTLEY from 1983 to 1985 and 1988
to 1989). I would like to plot using type= 'b' so that the points are
connected with lines, but when doing that, the values between 1985 and 1988
are automatically connected which I don't want. I'd like the plot to start
again at the value where the gap ends (in my example from 1988 onwards). Is
there a solution for this?
Any help is kindly appreciated! Thanks for your help.
Kind regards,
fd
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
