R help - Jan 2011 - Getting total bar's label & value labels in a barplot

Hi,

I have been trying to get the label under the total column - i.e. a mean value
of columns 2 to 6 - in a barplot I generate with this script:

t1 <- tapply(A, B, sum)
t1[8] <- mean(t1[2:6])
t1 <- as.table(t1)
barplot(t1, ylim=c(0,3000))
mtext("Var1", side = 1, line = 3)
mtext("Var2", side = 2, line = 3)

I have been trying to use

axis(1, at=1:8,
labels=c("1","2","3","4","5","6","7","8"))

but I get labels not standing underneat the columns...can someone help me out on
this one?

Also, I would like to plot onto each bar the corresponding numerical value -
e.g. "1824" on the first bar, ecc...

Please notice that str(t1) would look like:

 Named num [1:8] 1824 2339 2492 2130 2360 ...
 - attr(*, "names")= chr [1:8] "1" "2"
"3" "4" ...

Thanks,
Luca


Mr. Luca Meyer
www.lucameyer.com
IBM SPSS Statistics release 19.0.0
R version 2.12.1 (2010-12-16)
Mac OS X 10.6.5 (10H574) - kernel Darwin 10.5.0

Try looking at the barplot function and notice that is should be  
returning values for the mid-points. You should use those instead of  
the at=values


On Jan 9, 2011, at 12:03 PM, Luca Meyer wrote:
> Hi,
>
> I have been trying to get the label under the total column - i.e. a  
> mean value of columns 2 to 6 - in a barplot I generate with this  
> script:
>
> t1 <- tapply(A, B, sum)
> t1[8] <- mean(t1[2:6])
> t1 <- as.table(t1)
> barplot(t1, ylim=c(0,3000))
> mtext("Var1", side = 1, line = 3)
> mtext("Var2", side = 2, line = 3)
>
> I have been trying to use
>
> axis(1, at=1:8,
labels=c("1","2","3","4","5","6","7","8"))
>
> but I get labels not standing underneat the columns...can someone  
> help me out on this one?
>
> Also, I would like to plot onto each bar the corresponding numerical  
> value - e.g. "1824" on the first bar, ecc...
>
> Please notice that str(t1) would look like:
>
> Named num [1:8] 1824 2339 2492 2130 2360 ...
> - attr(*, "names")= chr [1:8] "1" "2"
"3" "4" ...
>
> Thanks,
> Luca
>
>
> Mr. Luca Meyer
> www.lucameyer.com
> IBM SPSS Statistics release 19.0.0
> R version 2.12.1 (2010-12-16)
> Mac OS X 10.6.5 (10H574) - kernel Darwin 10.5.0
>
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT