The most expressed genes

[Saeideh]

Hi all~~

I have sequence reads of two samples (Each for one condition).

I used Cufflinks package to identify differential expression.

Now, I have to find the most expressed gene.
from https://www.biostars.org/p/114291/ I understood I should draw histogram by R (ggplot2? cummeRbund?)

As much as I look for commands tutorials on how to draw histogram, I cannot find helpful one. For example I know how to plot histogram with ggplot2 (I followed the manual) but I do not know how to tell ggplot2 to look for my data in cuffdiff outputs.

Would you please help me

Thanks in advance