Problem with Fit command

*To*: mathgroup at smc.vnet.net*Subject*: [mg127685] Problem with Fit command*From*: jfonfria <juanjose.cisneros at boltes.com.es>*Date*: Wed, 15 Aug 2012 03:32:25 -0400 (EDT)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*Delivered-to*: l-mathgroup@wolfram.com*Delivered-to*: mathgroup-newout@smc.vnet.net*Delivered-to*: mathgroup-newsend@smc.vnet.net

Dear collages, Congratulations for the group. I didn`t know that it exist before, if I know it before... I have the next problem: I solve a linear system, and then I want to do a parametric study by modifing the variables of the result obtained. The last step is to Fit a curve to this result acording to the parameters. But when I solve the variable, I have the value between {}, and then when I apply the Fit command, it doesn't run I send to you some of the code and also the matrix that I obtained where I want to apply the Fit command): KGpf.{Dpfz1, Dpfz2, Tpfy2, Tpfy3} == {F, 0, 0, 0}; solpf = Solve[%, {Dpfz1, Dpfz2, Tpfy2, Tpfy3}]; Where KGpf is a 4x4 matrix (which depends of 3 parameters), Dpfz1,Dpfz2, Tpfy2 and Tpfy3 are the variables of the problem. Then I obtained the parameters of the first column column of the matrix with the next command: Kpf = F/Dpfz1 /. solpf; { {{128053.}, 12, 15, 5}, {{247597.}, 12, 15, 8}, {{291355.}, 12, 15, 10}, {{329071.}, 12, 15, 12}, {{405650.}, 12, 15, 15}, {{526921.}, 12, 15, 18}, {{639197.}, 12, 15, 20}, {{780108.}, 12, 15, 22}} Best regards, Juan Jose