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Re: Create a cumulative list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg93357] Re: Create a cumulative list
  • From: dh <dh at metrohm.ch>
  • Date: Wed, 5 Nov 2008 04:51:47 -0500 (EST)
  • References: <gepb4g$sjd$1@smc.vnet.net>


Hi Philipp,

FoldList is what you are looking for:

FoldList[If[Abs[#2]>0.002,0,#2+#1]&,0,data]

Note that this gives an additional first element. You may renmove it by 

"Rest".

hope this helps, Daniel



philipp wrote:

> Hi to all,

> 

> I have a problem creating a program in Mathematica and I can't find

> how to do it. Actually, I found a way to find my answer, but it takes

> 59 lines ... and I need this kind of thing 4 times.

> 

> So here is my problem. I have a list of values let's say ValueList =

> {1,2,3,4,5,6,7,8,9}

> What I want is Compilation = {1,3,6,10,15,21,28,36,45} created in

> adding Compilation[[1]] with ValueList[[2]] to create

> Compilation[[2]]. In the same way, Compilation[[7]] = Compilation[[6]]

> + ValueList[[7]].

> 

> If that wasn't enough, I need to add a difficulty to that. If, at any

> time, a value of Compilation[[i]] is bigger that XYZ, then that

> Compilation[[i]] should be equal to 0.

> 

> To help you understand (sorry but English is not my first language and

> explaining it in my first language is already tough), here is the

> results I am looking for.

> 

> My ValueList = {0.0032833, -0.000654511, -0.0065494, 0.00103598,

> -0.00112899, 0.00386173, 0.00365922, 0.00551557, -0.0138527,

> 0.00471387, 0.00497326, -0.00140056, -0.00187003, -0.0195785,

> -0.00210204, -0.00900038, 0.000289855, 0.000289771, -0.00135187,

> 0.00386772}

> My Compilation = {0, -0.000654511, 0, 0.00103598, -0.0000930101, 0, 0,

> 0, 0, 0, 0, -0.00140056, 0, 0, 0, 0, 0.000289855, 0.000579626,

> -0.000772247, 0}

> and the additionnal criteria is >0.002 and <-0.002  (or >0.002 in

> absolute value)

> 

> If anyone can help me please.

> 

> Thanks

> 





-- 



Daniel Huber

Metrohm Ltd.

Oberdorfstr. 68

CH-9100 Herisau

Tel. +41 71 353 8585, Fax +41 71 353 8907

E-Mail:<mailto:dh at metrohm.com>

Internet:<http://www.metrohm.com>




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