[R] Using lapply and list names not available

From: john seers \(IFR\) <john.seers_at_bbsrc.ac.uk>
Date: Tue, 5 Feb 2008 16:05:05 -0000

Hello All

Using lapply and ending up with lists of lists I often end up in the position of not having the names of the list passed by lapply. So, if I am doing something like a plot, and I would like the title to reflect which plot it is, I cannot easily do it. So I find myself doing some unstructured variable passing and counting to be able to keep track of my data. Then I think perhaps I should not use lapply and just use simple loops.

Is there a better way to do this?  

Here is a simple example to illustrate what I am talking about. The list has the names of people and I need the names to use as the headings of the plots.

########################################################################
#########

# Make some test data

people<-list(Andrew=rnorm(10), Mary=rnorm(10), Jane=rnorm(10), Richard=rnorm(10))

# Function to plot each list entry with its title name
doplot<-function(individual, peoplenames) {

    peoplecount<<-peoplecount + 1
    plot(individual, main=peoplenames[peoplecount]) }

#

peoplecount<-0
jpeg(file="test.jpg")
par(mfrow=c(2,2))
lapply(people, doplot, names(people))
dev.off()

########################################################################
#############

Thank you for any suggestions.

John Seers

---

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Received on Tue 05 Feb 2008 - 16:08:10 GMT

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