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comment Using a Mathematica index as a DiscreteVariable in NDSolve when solving a coupled set of ordinary differential equations
What is n in the Sum and in the WhenEvent?
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awarded  Enlightened
2d
awarded  Nice Answer
2d
comment MovingAverage to include the average of the first and last elements in a list
@user170231 Glad I could help! Thank you for the accept.
2d
answered MovingAverage to include the average of the first and last elements in a list
2d
comment How to find max difference with the same x between two functions?
@instajke Seems like it was not.
May
26
comment ODE fitting to dataset
@BlueOysterCult That's exactly right! The order of the solutions of any solver is given by the order specified in the input. And in the model function the i variable is the index of the solution you are extracting, so 1 is Ec and 2 is EP.
May
26
comment ODE fitting to dataset
@BlueOysterCult That's weird. It takes like 2 seconds on my crappy machine. Note I made an edit, I forgot to put the value for tmax. One of the problems I saw was that you weren't specifying any starting points for the NonlinearModelFit to work properly. That might be why you were getting odd results.
May
25
revised ODE fitting to dataset
added 15 characters in body
May
25
revised ODE fitting to dataset
added 88 characters in body
May
25
answered ODE fitting to dataset
May
24
answered How to find max difference with the same x between two functions?
May
14
answered non linear Least Squares with model function given by ODE's
May
14
comment non linear Least Squares with model function given by ODE's
Post your data and the function f, please.
May
12
comment How to plot trajectory for a differential equation in polar coordinates?
@KennyL : Done!
May
12
revised How to plot trajectory for a differential equation in polar coordinates?
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May
11
answered How to plot trajectory for a differential equation in polar coordinates?
May
11
answered How to find a length of a curve constructed using Spline?
May
7
answered How to Fit experimental data with 4D ParametricNDSolve?