Re: Table of tables

*To*: mathgroup at smc.vnet.net*Subject*: [mg113284] Re: Table of tables*From*: Ray Koopman <koopman at sfu.ca>*Date*: Fri, 22 Oct 2010 01:34:53 -0400 (EDT)*References*: <i9p6ig$og3$1@smc.vnet.net>

On Oct 21, 4:01 am, Luiz Melo <luiz.m... at polymtl.ca> wrote: > Thanks Sebastian and Valeri for the help. > > I'm actually looking for a function that operates only on the third > row of each column-matrix terms(which happen to be complex in the > example I gave), but leaves the other terms intact. Consider a > different example: > > Let > t = {{{-1, -1, -2}, {-1, -1, -3}}, {{-1, -1, -4}, {-1, -1, -5}}}; > > how can I get > > {{{-1, -1, 2}, {-1, -1, 3}}, {{-1, -1, 4}, {-1, -1, 5}}}; > > that is, in this case, I need a function that takes the Abs[] of > the 3rd row of each sub-matrix and leaves the other terms intact. > > Regards, > Luiz t /. {a_,b_,c_} -> {a,b,Abs[c]}