Re: Question on using Table in module
- To: mathgroup at smc.vnet.net
- Subject: [mg67926] Re: [mg67894] Question on using Table in module
- From: Bob Hanlon <hanlonr at cox.net>
- Date: Thu, 13 Jul 2006 06:53:28 -0400 (EDT)
- Reply-to: hanlonr at cox.net
- Sender: owner-wri-mathgroup at wolfram.com
Inside your module, x had the value {0,1} not the Symbol a. You want the first argument to be held SetAttributes[b, HoldFirst]; b[x_,n_,d_]:=Module[{},x[[n]]=d]; a = {1, 0} ; b[a,2,40]; a {1,40} Bob Hanlon ---- Nag <Naga1010 at gmail.com> wrote: > Hello: > > Look at the following code fragment. > > a = {1, 0} > b[x_,n_,d_]:=Module[{i},x[[n]]=d]; > b[a,2,40] > > ?a > a = {1, 0} > > Executing gives the error message: > Set::setps: {1, 0} in assignment of part is not a symbol. > > I followed the link to the Help browser, but do not understand the > explanation. > > What is happening here? Please help. > > Best > Nag >