Linked Questions

1 vote
1 answer
345 views

non linear Least Squares with model function given by ODE's

I have to fit to experimental data a model function given by a linear combination of functions y1(t) and y2(t) a1*y1(t) + a2*y2(t) with a1 and a2 ...
francesco's user avatar
1 vote
1 answer
2k views

How do I fit NDSolve result to experimental data? [duplicate]

I have two coupled ordinary differential equations which I solve numerically in Mathematica, but now I want to fit the solution with experimental data. I do following, (the experimental data ...
nitin's user avatar
  • 253
1 vote
1 answer
634 views

Dsolve too slow -- is there anyway around?

I am trying to solve: ...
Weiwei's user avatar
  • 11
0 votes
1 answer
223 views

NonlinearModelFit with of a single PDE parameterized several times

Edit: My approach was wrong, I have solved this - please see comments I've been scouring the answers and the docs but I'm having trouble figuring out the answer to this one. In particular, Olksander ...
Jake M's user avatar
  • 1
0 votes
1 answer
233 views

How to adjust excel data for NonlinearModelFit?

I'm really new to Mathematica and I'm facing a problem and would really appreciate some help! Maybe my question is similar to one described in How to fit 3 data sets to a model of 4 differential ...
OlgaE's user avatar
  • 21
0 votes
1 answer
904 views

Exporting tables of interpolating functions

A few weeks ago I asked a question about manipulating parameters in NDSolve (Looping with NDSolve?) , and received some very helpful advice about the manipulate environment; now I want to take the ...
DRG's user avatar
  • 877
4 votes
0 answers
325 views

Using FindFit to fit nonlinear ODE parameters, subject to a constraint (an inverse problem) [duplicate]

Similar to this post I am finding that constraints tend to make FindFit poor at finding a good fit. However, unlike the previous post, the constraints are required ...
Stretch's user avatar
  • 141
3 votes
0 answers
242 views

How to fit two datasets with common fit parameters?

I have two data sets which go: ...
D.Anishchenko's user avatar
2 votes
0 answers
854 views

How I can use FindFit to simultaneously fit two data sets to two equations having shared parameters? [duplicate]

I think that FindFit package with the method Nminimize yields global minimum if initial values of adjustable parameters are ...
Mousa Jafar's user avatar
2 votes
0 answers
219 views

Simultaneous fitting to multiple data sets with multiple variables and some common parameters [duplicate]

I am trying to fit two data sets to a function model described below which share a few common parameters. Say I have two functions with some common parameter(s) ...
Arijit's user avatar
  • 21
2 votes
0 answers
1k views

ParametricNDSolveValue or NDSolve + fitting

I have been trying to find the value for the parameter kestim that yields the best fit of a model to some data points. datac has ...
Sos's user avatar
  • 2,168
1 vote
0 answers
124 views

How to fit 3 data sets to a model of 3 differential equations?

I want to fit 3 data sets to a model consisting of 3 differential equations and 7 parameters. I want to find the parameters best fitting to my model. I have searched for several related examples. I ...
王晗青's user avatar
0 votes
0 answers
224 views

Problem fitting ODEs to data using NonlinearModelFit with ParametricNDSolveValue

The following code attempts to fit a system of differential equations (enzyme kinetics) to some data, which for now happens to be fake data extracted from a solution with a particular set of ...
HappyTreeFriend's user avatar
0 votes
0 answers
291 views

How to fit data with numerical solution of system of parametric ODE? [duplicate]

I need to find the parameters (k1,k2,k3,k4,k1r,k2r,k3r,k4r) that fit my data (list of [Intensity, time]) using the function <...
Irene's user avatar
  • 1
0 votes
0 answers
449 views

Performance in parameter estimation from ParametricNDSolve using varied initial conditions [duplicate]

I have 250 data points from a timecourse exeriment in a list, with columns specifying (1) time, (2-4) initial conditions, (5) absorbance reading. I want to fit 4 parameters (k1, k2, k3, k4) in a DAE ...
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