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MathGroup Archive 2005

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Re: Why this function does not return a single value

  • To: mathgroup at smc.vnet.net
  • Subject: [mg60296] Re: Why this function does not return a single value
  • From: Bill Rowe <readnewsciv at earthlink.net>
  • Date: Sat, 10 Sep 2005 06:46:44 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

On 9/9/05 at 4:07 AM, marekbr at gmail.com (Marek) wrote:

>I know that Mathematica treats space as a multiplication sign. What
>happens here is that when I remove the multiplication signs in Input
>mode, convert to Standard mode and then back to Input mode the
>multiplication signs reappear. I just did the following experiment.
>Opened fresh Mathematica notebook and typed in (in Standard mode)
>g[x_,a[1]_]:=a*x (no spaces anywhere) Executed that Then converted to
>Input mode and there will be a star between a[1] and the blanc sign _ .

In essence, g[x_,a[1]_]:= a*x is meaningless. This defines a function named g having an arbitrary first arguement you are naming x, an arbitrary second argument you are naming as the function a evaluated at 1 returning the product of the function and the first argument. Is this really what you want?

Perhaps, you want to create a function that returns the product of somehing and the first element of something else. That could be simply done as

g[x_, a_]:= x*First[a]

Or perhaps you want to return the product of something an a function evaluated at 1. That could be done as

g[x_,a_]:= x*a[1]
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