       Re: How to set y always greater than or equal to x for a function?

• To: mathgroup at smc.vnet.net
• Subject: [mg46585] Re: How to set y always greater than or equal to x for a function?
• From: "Bo Le" <bole79 at email.si>
• Date: Tue, 24 Feb 2004 21:04:37 -0500 (EST)
• References: <c1ehpp\$kgg\$1@smc.vnet.net>
• Sender: owner-wri-mathgroup at wolfram.com

```Helo!

The y domain specification in Plot3D cannot depended on x,
otherwise you could do something like {x,-100,100},{y,x,100},
but you can always IF your function, e.g.

myFunction[x_,y_]:=If[x>y,0,Sqrt[y-x]]

Plot3D[myFunction[x,y],{x,-100,100},{y,-100,100}]

Good bye,

Borut Levart
Slovenia

"Albert Franco" <francoatnsuok at earthlink.net> wrote in message
news:c1ehpp\$kgg\$1 at smc.vnet.net...
> I recently purchased Mathematica 5.0, and I am in the process of
> learning how to take advantage of it's many features.
>
> This is an example of one line I would like to calculate in Mathematica:
>
> Plot3D[Sqrt[y-x],{x,-100,100},{y,-100,100}];
>
>
> How can I best edit this line to make y always greater than or equal to x during
> calculation so the program doesn't try to take the square root of a
> negative number?
>
> Any help will be appreciated.
>
> Albert Franco
>
>
>
>

```

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