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Re: undefined function

  • To: mathgroup at smc.vnet.net
  • Subject: [mg95330] Re: undefined function
  • From: dh <dh at metrohm.com>
  • Date: Thu, 15 Jan 2009 06:14:20 -0500 (EST)
  • References: <gkkf6v$gsr$1@smc.vnet.net>


Hi Cetin,

obviously you must tell Mathematica that the output of your "direction" is a 

tensor. You e.g. may define:

Direction[x_]:=Array[G,{3,3}]

with this:

epp=f0 landmap direction[sigma];

epp[[1,1]]

gives: f0 landmap G[1, 1]



hope this helps, Daniel



Cetin Haftaoglu wrote:

> Dear users,

> 

> 

> 

> I want to use an undefined function in an expression like:

> 

> 

> 

>                 epp = f0 lamdap direction[sigma =96 X]

> 

> 

> 

> where f0, lamdap are scalar values and direction[sigma =96 X] is an undefined

> function, but the result of this function is a second order tensor

> (3x3-matrix).

> 

> How can I define this function?

> 

> Later I must take the elements of epp ( yp[1] = epp[[1,1]]) and follow up

> with this. When I try it now I get the error-message:

> 

> 

> 

> Part::partd : Part specification <<1>> is longer than depth of object.

> 

> 

> 

> Thanks in Advance, 

> 

> 

> 

> Regards

> 

> 

> 

> Cetin Haftaoglu

> 

> Arbeitsgruppe " Modellierung und Simulation in der Werkstoffmechanik"

> 

> BAM =96 Bundesanstalt f=FCr Materialforschung und -pr=FCfung

> Fachgruppe V.2 =96Werkstoffmechanik

> 

> 

> 

> Unter den Eichen 87

> 

> D-12205 Berlin

> 

> Deutschland

> 

> 

> 

> Tel:    +49-30-8104-3194

> 

> Fax:   +49-30-8104-1527

> 

> Email:  <mailto:cetin.haftaoglu at bam.de> cetin.haftaoglu at bam.de

> 

> Web:   www.bam.de

> 




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