RE: a simple product, but with "i = 1...n AND i != x"
- To: mathgroup at smc.vnet.net
- Subject: [mg70262] RE: [mg70243] a simple product, but with "i = 1...n AND i != x"
- From: "David Park" <djmp at earthlink.net>
- Date: Tue, 10 Oct 2006 06:12:19 -0400 (EDT)
You would have to specify n as a parameter, and in order to do the test x
would have to be at least numeric.
f[n_Integer?Positive][x_?NumericQ] :=
Module[{i, work},
work = Table[x - i, {i, 1, n}];
work = Select[work, N[#] != 0 &];
Times @@ work]
f[7][6]
-120
f[7][6.2]
-29.5207
Maybe you meant x to always be an integer?
David Park
djmp at earthlink.net
http://home.earthlink.net/~djmp/
From: xarnaudx at gmail.com [mailto:xarnaudx at gmail.com]
To: mathgroup at smc.vnet.net
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