Re: How can I totalize by month, by year?

• To: mathgroup at smc.vnet.net
• Subject: [mg111917] Re: How can I totalize by month, by year?
• From: Ray Koopman <koopman at sfu.ca>
• Date: Wed, 18 Aug 2010 07:08:09 -0400 (EDT)
• References: <201006301204.IAA27569@smc.vnet.net> <i4d6av\$6r3\$1@smc.vnet.net>

```On Aug 16, 10:22 pm, "Leandro Tenfen" <leandroten... at hotmail.com>
wrote:
> Hi,
>
> I'm new with Mathematica, I need some help to start it.
>
> I've got a date series like a cashflow, how can I totalize at each date
> change? And how can I totalize by month, by year, etc?
>
> For example:
>
> In[]=
>
> {{{{2010, 8, 3, 0, 0, 0.},
>    65.}, {{2010, 8, 3, 0, 0, 0.}, -72.}, {{2010, 8, 3, 0, 0, 0.},
>    45.}, {{2010, 8, 2, 0, 0, 0.}, 67.}, {{2010, 8, 2, 0, 0, 0.},
>    83.}, {{2010, 8, 2, 0, 0, 0.}, -42.}, {{2010, 7, 30, 0, 0,
>     0.}, -32.}, {{2010, 7, 30, 0, 0, 0.},
>    48.}, {{2010, 7, 30, 0, 0, 0.}, 12.}, {{2010, 7, 30, 0, 0, 0.},
>    34.}, {{2010, 7, 29, 0, 0, 0.}, -52.}, {{2010, 7, 29, 0, 0, 0.},
>    78.}, {{2010, 7, 29, 0, 0, 0.}, -26.}, {{2010, 7, 28, 0, 0, 0.},
>    45.}, {{2010, 7, 28, 0, 0, 0.}, -23.}, {{2010, 7, 28, 0, 0,
>     0.}, -32.}, {{2010, 7, 28, 0, 0, 0.},
>    74.}, {{2010, 7, 27, 0, 0, 0.}, 53.}, {{2010, 7, 27, 0, 0, 0.},
>    58.}, {{2010, 7, 27, 0, 0, 0.}, 25.}}}
>
> Out[]=
>
> {{{{2010, 8, 3, 0, 0, 0.}, 38.}, {{2010, 8, 2, 0, 0, 0.},
>    108.}, {{2010, 7, 30, 0, 0, 0.},
>    28.}, {{2010, 7, 29, 0, 0, 0.}, -10.}, {{2010, 7, 28, 0, 0, 0.},
>    64.}, {{2010, 7, 2, 0, 0, 0.}, 136.}}}
>
> Thanks
> Leandro Tenfen

Correcting my earlier post: for daily the SplitBy test function
should be #[[1,{1,2,3}]]&, and for yearly it should be #[[1,1]]&.

```

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