       Re: Compile for different parameter types

• To: mathgroup at smc.vnet.net
• Subject: [mg97403] Re: Compile for different parameter types
• From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
• Date: Thu, 12 Mar 2009 05:42:15 -0500 (EST)
• Organization: Uni Leipzig
• References: <gpacur\$mu6\$1@smc.vnet.net>
• Reply-to: kuska at informatik.uni-leipzig.de

Hi,

one of the reasons why CompiledFunction[]s are faster, is
that the types are fixed and the pattern matcher has not to search
what rule should be used. So you must make a function

f[a_?MatrixQ,b_?MatrixQ]:=CompiledFMatrixMatrix[a,b]
f[a_?VectorQ,b_?MatrixQ]:=CompiledFVectorMatrix[a,b]
f[a_?VectorQ,b_?VectorQ]:=CompiledFVectorVector[a,b]
..

Regards
Jens

Sebastian Meznaric wrote:
> Say I want to have a compiled function that works for tensors of rank
> 2 or 3. Let's call this function f. Then
>
> f = Compile[{{A,_Real,2},{B,_Real,2}}, expr]
>
> would make function f for tensor of rank 2. Is it possible to expand
> this function to work for both tensors of rank 2 and 3? Eventually I
> would like to obtain a compiled function that works for a wide (but
> limited) range of combinations of tensor ranks. All tensor ranks are
> less than 15 so we are talking about at most 15^2=225 combinations.
>

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