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