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How can I totalize by month, by year?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg111895] How can I totalize by month, by year?
  • From: "Leandro Tenfen" <leandrotenfen at hotmail.com>
  • Date: Tue, 17 Aug 2010 01:22:35 -0400 (EDT)
  • References: <201006301204.IAA27569@smc.vnet.net>

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 


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