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Re: How to Multiply a Sequence of #s that depends on the previous #

  • To: mathgroup at smc.vnet.net
  • Subject: [mg125098] Re: How to Multiply a Sequence of #s that depends on the previous #
  • From: Bill Rowe <readnews at sbcglobal.net>
  • Date: Tue, 21 Feb 2012 06:14:48 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com

On 2/20/12 at 2:46 AM, clutchderivative at gmail.com (Clutch) wrote:

>I have a list of #s : 1.10, 1.15, 1.20, 1.35.

>I start off with 50 and the first # is 50 * 1.10.
>The second # is the first # * 1.15.
>The third # is the second # * 1.20.
>The fourth # is the third # * 1.35.

>I want to maintain a list of these #s. How can this be done
>efficiently in Mathematica without running for loops?

If I understand correctly, you can do this by:

In[3]:= lst = FoldList[Times, 50, {1.1, 1.15, 1.2, 1.35}]

Out[3]= {50,55.,63.25,75.9,102.465}

and to show each subsequent value in lst has the correct ratio

In[4]:= 1/Divide @@@ Partition[lst, 2, 1]

Out[4]= {1.1,1.15,1.2,1.35}




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