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MathGroup Archive 1997

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RE: := vs. =

  • To: mathgroup at
  • Subject: [mg8896] RE: [mg8858] := vs. =
  • From: Jean-Marie THOMAS <jmthomas at>
  • Date: Thu, 2 Oct 1997 22:56:49 -0400
  • Sender: owner-wri-mathgroup at

Have a look in the MMA book and see the difference between Set and =
SetDelayed: for instance:
f[x_]=3DaCertainFunctionOf[data] makes sense if and only if data has =
already been defined. If not, you have to use f[x_]:=3D etc.

Jean-Marie THOMAS
Conseil et Audit en Ing=E9nierie de Calcul
Strasbourg, France
phone 03 88 32 93 64
email jmthomas at

-----Original Message-----
From:	Frank Roescher [SMTP:froesche at]
To: mathgroup at
Sent:	mercredi 1 octobre 1997 02:16
To:	mathgroup at
Subject:	[mg8858] :=3D vs. =3D

When I define a function on Mathematica, I use f[x_]=3Dxxxxx, without
using a colon.  It seems to work just fine.  Is there a risk in leaving
out the colon?  Thanks.


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