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Re: dynamic nested loops

  • To: mathgroup at smc.vnet.net
  • Subject: [mg122863] Re: dynamic nested loops
  • From: Ray Koopman <koopman at sfu.ca>
  • Date: Sun, 13 Nov 2011 04:42:51 -0500 (EST)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <j9irsq$8g5$1@smc.vnet.net>

On Nov 11, 2:03 am, Ron <rag... at verizon.net> wrote:
> i need to perform nested sums such as Sum[f, {i,imin,imax},
> {j, jmin, jmax}, ...{}].  In each nest the new index is a
> function of the previous and the max values vary.  Also at
> the beginning I do not know how long a nest I need.  I can't
> come up with anything that works.  I could construct a list
> {{i,imin,imax},{j, jmin, jmax}, ...{}} but "Sum" doen't know
> what to do with the outside braces{...}.
> ANy suggestions would be much appreciated.

If you don't know at the start how deep the nest will be, how are
you constructing the list {{i,imin,imax},{j, jmin, jmax}, ...{}} ?



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