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MathGroup Archive 2006

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Re: Thread function over matrix elements?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg69879] Re: [mg69865] Thread function over matrix elements?
  • From: Adriano Pascoletti <pascolet at dimi.uniud.it>
  • Date: Tue, 26 Sep 2006 05:21:24 -0400 (EDT)
  • References: <200609260459.AAA01827@smc.vnet.net>

Ben,
you must say "only at level 2, please", i.e.  Map[f,mat,{2}], not  
"levels up to 2" Map[f,mat,2].

Level specifications are described in Sect. A.3.6 of the Mathematica  
book.

Adriano Pascoletti


On 26 set 2006, at 06:59, ben wrote:

> Dear all,
>
> how do I thread a function over all elements of a matrix?
> This piece of code works, but I doubt its the way i am supposed to do
> this
>
> mat=Table[i+j,{i,0,2},{j,0,2}]
>
> Map[Map[f[#]&,#]&,mat]
>
> I tried
>
> Map[f[#]&,mat,2]
> Apply[f[#]&,mat,2]
> Thread[f[mat]]
>
> but they give weird results.
>
> Cheers
> Ben
>


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