Hi,
I am sorry that my question wasn not very clearly formulated. My real data
comes in 47 .csv files, one for each of 47 individual, for example:
"","Fish_ID","Date","R2sqrt"
"1",1646,2006-08-18 08:48:59,0
"2",1646,2006-08-18 09:53:20,100
I would like to read the data for all individuals in the for loop below and
then combine them in a zoo object in order to plot them together. My question
is : How do I need to set up the for loop to deal with several individuals ? I
have put question marks the bits that I am missing.
I very much appreciate your help.
Regards,
Juliane
ReleaseDates <- read.csv(file="ReleaseDates",head=TRUE,sep=",")
#reads in the individuals and their release dates
for (i in 1:length(ReleaseDates)){
Fish_ID <- ReleaseDates$Fish_ID[i]
??? <-
read.zoo(file=paste("Results",Fish_ID,sep="_"),index.column=3,header=TRUE,FUN=as.chron,sep=",")
#reads in data for each in Fish_ID
}
z <- na.approx(cbind(???), na.rm = FALSE)
plot(z)
From: Gabor Grothendieck [ggrothendi...@gmail.com]
Sent: 24 September 2010 22:08
To: Struve, Juliane
Cc: r-help@r-project.org
Subject: Re: [R] plotting multiple animal tracks against Date/Time
On Fri, Sep 24, 2010 at 4:16 PM, Struve, Juliane <j.str...@imperial.ac.uk>
wrote:
Hi again,
when applying the code to my real data I need to deal with a large number of
individuals and massive data sets. I am using the code below to read in the
data for different individuals, and would like to create the "Lines" within the
loop. But "Lines" needs to have the variable Fish_ID somehow included in the
name, as otherwise the string will be overwritten on each execution. How can I
create a different "Lines" for each Fish_ID ? Or is there a better way of doing
this ? Sorry, this is surely a beginner's question.
Thank you very much for your help.
Regards,
Juliane
ReleaseDates <- read.csv(file="ReleaseDates.csv",head=TRUE,sep=",")
for (i in 1:length(ReleaseDates$Fish_ID)){
Fish_ID <- ReleaseDates$Fish_ID[i]
Data <- read.csv(paste(Fish_ID))
Lines <- paste(Data$Date,Data$Distance)
print Lines
}
That was just an example. The purpose of Lines was to make the example self
contained and reproducible. In reality you dont use Lines at all. Also your
post suggested that they were in separate files since you had headings on each
one. If that is not the case then you just read it all at once using read.zoo.
z <- read.zoo(ReleaseDates.csv", split = "Fish_ID", header = TRUE, sep = ",",
...whatever...)
There are three vignettes (pdf documents) that come with zoo. Read them all
and read the help page of read.zoo.
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