[R] grouping data together

[Swanton0822]

Hi.
i have a data, and there is 3 columns, Month, Year and Total. and there is
over 1000 rows for them because there is 87 years data for every month, so
there is month from Jan-Dec, and year from 1900-1987,
so i was wondering if i would want to make 12 groups (Jan,Feb.......,Dec),
and put each year's total into the corresponding month (so every month group
will have 88 values of total)
how can i do that?
many thanks.
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