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MathGroup Archive 2006

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Re: a simple product, but with "i = 1...n AND i != x"

  • To: mathgroup at smc.vnet.net
  • Subject: [mg70250] Re: [mg70243] a simple product, but with "i = 1...n AND i != x"
  • From: Adriano Pascoletti <pascolet at dimi.uniud.it>
  • Date: Tue, 10 Oct 2006 06:11:55 -0400 (EDT)
  • References: <200610090555.BAA19674@smc.vnet.net>

In[1]:= f[x_] := Times @@ (x - #1 & ) /@ DeleteCases[Range[n], x]

In[2]:= n = 5; f[y]
Out[2]= (-5 + y)*(-4 + y)*(-3 + y)*(-2 + y)*(-1 + y)

In[5]:= n = 5; f[4]
Out[5]= -6

Adriano Pascoletti

On 9 ott 2006, at 07:55, xarnaudx at gmail.com wrote:

> hi,
> i would like to make a function like
> f[x_] := Product[x - i, {i, 1, n} AND i != x}
>
> obviously, the end of the expression is syntactically incorrect. But
> how to rewrite this product correctly?
> thanks
>


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