Re: Simply but handy question

*To*: mathgroup at smc.vnet.net*Subject*: [mg124862] Re: Simply but handy question*From*: Peter Breitfeld <phbrf at t-online.de>*Date*: Thu, 9 Feb 2012 05:44:38 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <jgtist$6bb$1@smc.vnet.net>

Maybe like this: SetAttributes[myUnitize,Listable] maUnitize[x_]:=If[x==0,0,1,1] In: myUnitize[Y] Out: {{1, 1}, {0, 1}} jediwhelan wrote: > Dear group members, > > I am new to mathematica (well, I'm not actually but I haven't used it > in 5 years +). > > Is there an easy way to return a matrix X of 1's and 0's to test > whether the entries in Y > are different from zero. > > i.e., > > if Y = {{a,b},{0,c}} > > Then X would return > > X = {{1,1},{0,1}} > > This would be handy for very large or complicated matrices where one > would like to know if specific entries are zero? > > Many thanks, > Paul > -- _________________________________________________________________ Peter Breitfeld, Bad Saulgau, Germany -- http://www.pBreitfeld.de