R help - Jul 2009 - side-by-side Barplot newbie question

Hi,

I am new to R and  I hope someone can help me with my problem. I am trying
to draw a side by side barplot.

There is a main experiment and there are many sub experiments within the
main experiment. I would like to draw a bar plot showing the number of
sub_experiments done for each main_exp.  For instance if the Main_Exp is 6,
I would like to group the sub exp's for the main_exp and show that there
were two sub_exp's done an ELISA and a FCM and that the ELISA was done once
and the FCM was done twice.  Similarly for Main_Exp 7 I would like to show
that for there were ELISA,FCM,qPCR,Telometry done and that they had a count
of 3,3,2,5 respectively. This is what my dataset looks like:

Task                      Datatype  Count
1                            ELISA                 2
6                            ELISA                 1
6                             FCM                   2
7                             ELISA                 3
7                             FCM                   3
7                             Telometry            2
7                             qPCR                  5

The code that I have is

table(comparisons_new)

barplot(as.matrix(comparisons_new$Sub_Exp_Count),xlab="Main_Exp_Name",
ylab="Sub_Exp_Count",ylim=c(0,10),names.arg=(comparisons_new$Main_Exp_Name),beside=TRUE,legend=rownames(compariso
ns_new$Sub_Exp_Name),col=rainbow(5))

	[[alternative HTML version deleted]]