       Re: problem writing a simple equation--urgent!!!

• To: mathgroup at smc.vnet.net
• Subject: [mg50360] Re: [mg50359] problem writing a simple equation--urgent!!!
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Mon, 30 Aug 2004 01:34:32 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```x[y_] := y^2;

u[y_, z_] := x[y] + 2*x[z]

u[2,4]

36

Bob Hanlon

>
> From: erkenays at yahoo.com (aysegul)
To: mathgroup at smc.vnet.net
> Date: 2004/08/29 Sun AM 03:54:07 EDT
> To: mathgroup at smc.vnet.net
> Subject: [mg50360] [mg50359] problem writing a simple equation--urgent!!!
>
> Hi all,
> I have a problem about writing an equation in mathematica.
> I am writing the following equation:
> u[x_, y_] = x + 2*y
> and when I write for example u[2,4] , it gives the result. But the
> problem that I have is expressing this equation with parameters. That
> is
> u[x, x] = x + 2*x
> but when I ask u[2,4];
> it gives u[2,4] result.It doesn't calculate.
> So, how can I write this equation?
> Thanks all.
>
>

```

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