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Re: Machine-size real number?

  • To: mathgroup at
  • Subject: [mg33153] Re: Machine-size real number?
  • From: Jens-Peer Kuska <kuska at>
  • Date: Wed, 6 Mar 2002 01:55:27 -0500 (EST)
  • Organization: Universitaet Leipzig
  • References: <a61uom$gom$>
  • Reply-to: kuska at
  • Sender: owner-wri-mathgroup at


function calls are written with [] in Mathematica and

f[x_] := 1 - (Cos[\[ExponentialE]^(3x/4)])

is correct.

Second functions should have *arguments* f is a symbol, f[x] is
a function call, so, f[x] will work:

Plot[f[x], {x, a, b}]

Since Plot has the attribut HoldAll you should use

Plot[Evaluate[f[x], {x, a, b}]]


Mike O'Leary wrote:
> I'm trying to plot this function
> f[x_] := 1 - (Cos(\[ExponentialE]^(3x/4)))
> {a, b} = {-1, 1.5}
> Plot[f, {x, a, b}]
> and I keep getting an error that says f is not a machine-size real number at
> x = -1.  Any help would be appreciated.

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