CODEWITHSUNDEEP
r
Ross D.
Ross D.

Reputation: 21

labeling in barplot()

I am attempting to add names to the columns of my bar plot... There are 2 bars in each group that would share the same name..

I am using code like this:

l<-c(.6286, .2212, .9961, .5831, .8703, .6990, .9952, .9948)

r<-c(.2721, .5663, .0, .3961, .0696, .1180, .0, .0)

tab<-rbind(l,r)

plot<-barplot(tab, beside=TRUE, axisnames=FALSE, main = 'Time Spent Left vs. Right', sub = 'Female 2c', xlab= 'Days After Entry', ylab = 'Proportion of Time Spent', col=c('blue', 'red'), ylim = c(0,1))
legend('topleft', .8,  c('Left' , 'Right'), pch=c(.8), col=c('blue', 'red'))
names.arg = jd2c$d.in.p

names.arg=c(3,4,5,6,6,7,10,11) #listed for informational purposes, same as jd2c$d.in.p

jd2c$d.in.p is also listed above.. For some reason the names.arg function does not seem to be doing what I would expect. Even if I put it within the parenthesis of the bar plot() function..

What am I doing wrong?

Thank you!

Upvotes: 2

Views: 6046

Answers (2)

David Robinson
David Robinson

Reputation: 78630

You are defining names.arg not as an argument to the barplot function, but as a completely separate variable- it is outside the parentheses. This:

plot<-barplot(tab, beside=TRUE, axisnames=FALSE, main = 'Time Spent Left vs. Right', sub = 'Female 2c', xlab= 'Days After Entry', ylab = 'Proportion of Time Spent', col=c('blue', 'red'), ylim = c(0,1))
legend('topleft', .8,  c('Left' , 'Right'), pch=c(.8), col=c('blue', 'red'))
names.arg = jd2c$d.in.p

should be:

plot<-barplot(tab, beside=TRUE, axisnames=FALSE, main = 'Time Spent Left vs. Right', sub = 'Female 2c', xlab= 'Days After Entry', ylab = 'Proportion of Time Spent', col=c('blue', 'red'), ylim = c(0,1), names.arg = jd2c$d.in.p)
legend('topleft', .8,  c('Left' , 'Right'), pch=c(.8), col=c('blue', 'red'))

You must also set axisnames=TRUE for the names to appear.

Upvotes: 1

Ben Bolker
Ben Bolker

Reputation: 226871

Using your data and setting names.arg appropriately and axisnames=TRUE, I get a reasonable result. I tweaked a couple of other things (set las=1 to turn axis labels horizontal, used fill rather than col in the legend, got rid of pch=0.8).

par(las=1)
bnames <- c(3,4,5,6,6,7,10,11) #listed for informational purposes, same as jd2c$
plot<-barplot(tab, beside=TRUE, axisnames=TRUE,
              main = 'Time Spent Left vs. Right',
              sub = 'Female 2c', xlab= 'Days After Entry',
              ylab = 'Proportion of Time Spent',
              col=c('blue', 'red'), ylim = c(0,1),
              names.arg=bnames)
legend('topleft', cex=1,  c('Left' , 'Right'), fill=c('blue', 'red'))

enter image description here

Upvotes: 1

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