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RE: product formula in mathematica

• To: mathgroup at smc.vnet.net
• Subject: [mg68744] RE: [mg68702] product formula in mathematica
• From: Hartmut.Wolf at t-systems.com
• Date: Fri, 18 Aug 2006 03:11:44 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

>-----Original Message-----
>From: frou [mailto:quantieny at gmail.com] 
To: mathgroup at smc.vnet.net
>Subject: [mg68744] [mg68702] product formula in mathematica
>
>Hi I am interested in doing a product over a set of indices that are
>not continuous
>Product [ f(x_i) , { x_i, 1,3,4,9}]     Is this possible it appears
>that the iterator wouldonly take sequences such as 1...10 etc.
>
>Thanks
>

(If necessary) to understand

In[8]:= Product[f[x], {x, 1, 10, 3}]
Out[8]= f[1] f[4] f[7] f[10]

please look into Help.


But perhaps you intend

In[9]:= Times @@ f /@ {1, 3, 4, 9}
Out[9]= f[1] f[3] f[4] f[9]

--
Hartmut