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Re: Counting nonzeros

• To: mathgroup at smc.vnet.net
• Subject: [mg86893] Re: Counting nonzeros
• From: Peter Pein <petsie at dordos.net>
• Date: Tue, 25 Mar 2008 01:17:31 -0500 (EST)
• References: <fs7iml$gma$1@smc.vnet.net>

carlos at colorado.edu schrieb:
> I want to count the # of NZ entries in an arbitrary multilevel list,
> say exp, that contains only integers.  Is this the easiest way:
> 
>   k = Length[Flatten[exp]]-Count[Flatten[exp],0]
> 

Count[Flatten[exp],Except[0]] is a bit shorter

Peter