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Re: Chain Matrix

  • To: mathgroup at smc.vnet.net
  • Subject: [mg96456] Re: Chain Matrix
  • From: dh <dh at metrohm.com>
  • Date: Sat, 14 Feb 2009 03:07:16 -0500 (EST)
  • References: <gn3bvk$q50$1@smc.vnet.net>


Hi Antonio,

if I understand correctly, you have a list of matrices of which you wnat 

the Dot product. "Apply" is mader for you!. E.g.:

lom = {m1, m2, m3};

Dot@@lom

gives what you want, Daniel



Antonio Carlos Siqueira wrote:

> Hi everyone!

> I have a matrix in which all the elements are function of a scalar h,

> Say q[h]={{q1,q2},{q3,q4}} and what I need is to create a chain matrix

> so I can obtain the dot product of several q[h]. For instance, if  h=

> {h1,h2,h3}

> I can create a large matrix with

> m=Map[q,h]

> Then I do

> Dot[m[[1]],m[[2],m[[3] ]

> 

> The problem is that there are cases where the Length[h] may reach a

> few hundreds and I do not want to write Dot[m[[1]], ..., m[[200]] ]

> So  I have a somewhat trivial question:

>  Is there any way I can do this automatically? I mean how can I create

> a function to create an equivalent matrix from a chain of matrices?

> I tried some solutions with thread and fold, but I did not get

> anywhere, any thoughts are appreciated.

> 

> Thanks

> 

> Antonio

> 




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