Re: display of function
- To: mathgroup at smc.vnet.net
- Subject: [mg58522] Re: display of function
- From: Peter Pein <petsie at dordos.net>
- Date: Tue, 5 Jul 2005 06:34:14 -0400 (EDT)
- References: <dad7oo$t91$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
Bosch, Darrell schrieb:
> Dear Math Group:
>
> The first equation below shows a function for u(y) which is
> the sum of the products of pi times yi. In the following steps, I
> assign values of p and y. How can I get Mathematica to display the
> numerical value of u for the given p and y values? When I insert the
> u[y] command, I just get a repeat of the equation I have entered.
> Thanks for your suggestions. This group is a great help. Darrell
>
>
>
> u[y_] := Sum[Subscript[p, i]*Subscript[y, i],
>
> {i, 1, n}]
>
>
>
> p = {.3,.4,.3}
>
>
>
> y={10000, 20000, 30000}
>
>
Hi,
just guessing:
* you want Part[], not Subscript
* you mean Length[p] (or Length[y]), not n
* you expect the dot-product {.3,.4,.3).{10000, 20000, 30000}
Am I right?
--
Peter Pein
Berlin
http://people.freenet.de/Peter_Berlin/