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MathGroup Archive 2002

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Re: more elements in a list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg32279] Re: [mg32241] more elements in a list
  • From: Omega Consulting <omega_consulting at yahoo.com>
  • Date: Wed, 9 Jan 2002 23:38:00 -0500 (EST)
  • Sender: owner-wri-mathgroup at wolfram.com

At 02:17 AM 1/9/2002, merkat wrote:
>Hi ,
>
>How do I multiply the number of elements in a list?
>I have the lists:
>{a,b,c}  and
>{2,5,4}
>
>the result should be:
>{a,a,b,b,b,b,b,c,c,c,c}
>
>Merkat

Looks like a job for the often overlooked MapThread.

letters={a,b,c};
numbers={2,5,4};

Flatten[MapThread[Table[#1,{#2}]&, {letters, numbers}]]

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