[R] Multiple plots and postscripts using split function

PIKAL Petr petr.pikal at precheza.cz
Fri Aug 1 11:27:32 CEST 2014 

Hi

Maybe others will disagree but I find for cycle for this type of task better than sapply.

for(i in 1:length(ind)) {

if (there are more than 3 date items*) {

postscript(ind[i])
do all plotting
dev.off()
}}

If you want to plot with gaps you need to add all relevant YEARs for x axis with missing value in y before plotting. Then R plots it automatically with gap.

x<-1:10
y<-rnorm(10)
y[5:6]<-NA
plot(x,y, type="b")

I would suggest to use merge for this task.

table(dat$ID)
gives you number of unique values for each ID and you can use it for discarding this ID from the list.

Regards
Petr


> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of fd
> Sent: Thursday, July 31, 2014 4:37 PM
> To: r-help at 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
>
>
>
> --
> View this message in context: http://r.789695.n4.nabble.com/Multiple-
> plots-and-postscripts-using-split-function-tp4694850.html
> Sent from the R help mailing list archive at Nabble.com.
>
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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.

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