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Controlling function arguments

• To: mathgroup at smc.vnet.net
• Subject: [mg48817] Controlling function arguments
• From: Virgil Stokes <Virgil.Stokes at it.uu.se>
• Date: Thu, 17 Jun 2004 04:07:39 -0400 (EDT)
• Organization: Systems & Control
• Sender: owner-wri-mathgroup at wolfram.com

I found the following Mathematica code:

  NumberVectorQ[x_] := VectorQ[x] && And @@ NumberQ /@ x;
  functionx[k_Integer?Positive, v_?NumberVectorQ, w_?NumberVectorQ, 
q_?NumberVectorQ] := .....

where, I have left out the body of this function (functionx). What does 
the first line actually accomplish?

--V. Stokes

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