Re: Drop elements from list
- To: mathgroup at smc.vnet.net
- Subject: [mg94307] Re: Drop elements from list
- From: Ray Koopman <koopman at sfu.ca>
- Date: Wed, 10 Dec 2008 04:46:06 -0500 (EST)
- References: <ghdmqj$flr$1@smc.vnet.net> <ghlme9$k26$1@smc.vnet.net>
Correcting an omission from my previous post:
On Dec 9, 3:56 am, SigmundV <sigmu... at gmail.com> wrote:
> ... it seems that too much time is spent in Complement.
Here's an adaptation of Carl Woll's "missing" from his July 15, 2005,
post in the thread "Complement replacement":
komplement[n_, list_] := Block[{r = Range@n}, r[[list]] = 0;
SparseArray[r] /. SparseArray[_,_,_,x_]:>x[[3]]]