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Groups > comp.soft-sys.math.mathematica > #3201

Multiple use of Set on lists

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Hello,

I have a largish list of awkwardly "indexed variables", of the form cs = 
{c[1/2][-(1/2)][1/2][-(1/2)][-1], c[1/2][-(1/2)][1/2][1/2][-1]......etc....
....} which need to be assigned random values multiple times inside a Do loop. I was hoping I could generate a new list of random numbers each time then do something like

MapThread[Set, {cs, rands}]

Where "rands" would be the list of random numbers. I'm clearly misunderstanding how MapThread works though as this doesn't work. Rather than getting "c[1/2][-(1/2)][1/2][-(1/2)][-1]=new random number", instead "old random number=new random number" is what seems to be happening.

As a last resort I thought I would just clear the variables at the beginning of the do loop but you can't use Clear to do this and I don't see how you can apply "=." (Unset) over a list either.

Any suggestions?

Many thanks,

Jonny

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Thread

How to find one expression in terms of another expression? Jacare Omoplata <walkeystalkey@gmail.com> - 2011-06-19 23:29 +0000
  Re: How to find one expression in terms of another expression? Ray Koopman <koopman@sfu.ca> - 2011-06-20 23:37 +0000
    Re: How to find one expression in terms of another expression? Jacare Omoplata <walkeystalkey@gmail.com> - 2011-06-21 11:18 +0000
  Multiple use of Set on lists Jonathan Frazer <J.Frazer@sussex.ac.uk> - 2011-06-20 23:38 +0000
    Re: Multiple use of Set on lists Oleksandr Rasputinov <oleksandr_rasputinov@hmamail.com> - 2011-06-21 11:17 +0000
  Re: Multiple use of Set on lists Leonid Shifrin <lshifr@gmail.com> - 2011-06-25 09:31 +0000

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