Hi all,

For several reasons I have no used CARN R in months....I have an idea and I
want to retry to learn CRAN R.

I know I need to formulate more "intelligent" questions but I will expose
and if someone can help me I would be very gratefull I promise to try to
learn again....

The question I have a data file like this:

Date, Time, Tip
13/11/2008,23:16:00,432
13/01/2009,23:17:00,633
13/11/2009,23:16:00,134
13/12/2009,23:17:00,234
13/01/2010,23:16:00,111

I want to make an statistic (the sum of tip) but to extract one sum by each
different minute in Time, so you see, in this easy example I will have a
final table with two items:

Item Sum
16 (432+134+111)
17 (633+234)

Of course in my file (is bigger) I have minutes from 0 to 59.

Would it be too much difficult if I want this analysis but on table for each
day (indentified in the column Date) of the week. So you see on
13/11/2008  was thursday so you go each day and sum if this day is thrusday
from 0 to 59 minutes...

MAny thanks for all, each tip you give me I will send thousands of
thanks¡¡¡¡¡

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