Services & ResourcesWolfram ForumsMathGroup Archive

[Date Index] [Thread Index] [Author Index]

Howto sum up a list?

• To: mathgroup at smc.vnet.net
• Subject: [mg106913] Howto sum up a list?
• From: Jonas Stein <news at jonasstein.de>
• Date: Thu, 28 Jan 2010 02:43:17 -0500 (EST)

How can i sum up the list:

MyList = {{eggs, 4}, {milk, 1}, {eggs, 1}, {milk, 1}}

I want to get something like: 

{{eggs, 5},{milk, 2}}

I tyied Tally[], but that ignored the factor 4 in {eggs, 4}

Thank you. 

-- 
Jonas Stein <news at jonasstein.de>

• Follow-Ups:
  • Re: Howto sum up a list?
    • From: Tomas Garza <tgarza10@msn.com>
  • Re: Howto sum up a list?
    • From: Leonid Shifrin <lshifr@gmail.com>
  • Re: Howto sum up a list?
    • From: Adriano Pascoletti <adriano.pascoletti@dimi.uniud.it>
  • Re: Howto sum up a list?
    • From: Fred Simons <f.h.simons@tue.nl>