R help - Sep 2010 - how to assemble data of the same variable?

hi i'm francesco, i'am a new r user.

I have a dataset with these variables

 [1] "timestamp"      "categoria"      "lat"      
"long"
"ammontare_euro"
[6] "provincia"      "risoluzione"

and i want to make an analjsy on the data of variable 'categoria'.

now the variable 'categoria' has 98 different variable

c=levels(X[caregoria])
> length(c)
[1] 98

how can i create a plot (eg. an histogram) for each the categoria's variable
for the variable 'ammontare_euro'?

yhank you

fra
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