[R] Histogram/Bar plot graph

[Senthil Kumar M]

Hi,

I have the following data:

> Myvalues
     Gene          ES   MEF Embryo      ESHyp
1   GeneA   -0.38509507  0.00 1.6250  1.7039921
2   GeneB    0.06262914  0.00 1.6250 -0.272033
and so on...

I want to plot the expression values of GeneA and GeneB in the
different cell/embryo/conditions (columns 2:5 above). Now, if I do:

>library(ggplot2)
> qplot(x=Gene, Embryo, geom = "bar")

I get a plot of GeneA, B...so on only for the Embryo (ie column 4).

How do I get to plot multiple instances of Y for the same value of X ?

I have tried to find this out myself, but it is a bit confusing and
so, I am writing to the list as a last resort.

Any help or guidance will be much appreciated.

TIA,

Senthil