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}