Grouping data for specific time points on R

Hi,

I have data collected at 3 different time points. For each time point I have 3 different controls and then 7 different concentrations for an added treatment. Data is set out like this:

Control 1 Control 2 Control 3 Conc 1 Conc 2 Conc 3 Conc 4 Conc 5 Conc 6 Conc 7 Time point

I want to plot a histogram showing all the concentrations on one axis against one of the controls and then for each time point separately.

Thanks

I think we need a bit more information

Sorry I am an amateur, what information should I provide to help?

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