D
- To: mathgroup at smc.vnet.net
- Subject: [mg94401] D
- From: "Cetin Haftaoglu" <cetin.haftaoglu at bam.de>
- Date: Fri, 12 Dec 2008 06:53:20 -0500 (EST)
Dear mathematica users, I have a to evaluate the Jacobian matrix from a vector of function fi, i=1,21 with the inner variables yi, i=1, 21 and epsj j=1,6. So I have to evaluate D[f_i [yi,epsj] , y_j], i= 1, 21, j=1, 21. How can I write this expression in a short form, without to say that the functions f_i depent on the inner variables yi. When I write D[f_i,yi] I receive 0 because mathematica thinks that I want derive a Constant. When I say D[f_i[y1,y2,y3,=85.,y21,eps1,=85eps6],y_j] ], i= 1, 21, j=1, 21 I get the right expression but a very great expression (output). How can I reduce this output? TIA, 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