4 votes

Solving system of first order PDEs

Update: Solution accuracy modestly improved and accuracy estimate appended. The Finite Element Method used in the last section of the question approximates the PDEs by thousands of sparsely coupled ...
bbgodfrey's user avatar
  • 60.7k
4 votes
Accepted

How to solve this integral equation numerically?

Although the general problem in the question probably requires the methods referenced by flinty in 285076, the specific problem contained in the question's code, ...
bbgodfrey's user avatar
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4 votes
Accepted

Solving A System of Two Implicit Equations

First plot the function you want tointerpolate ...
Ulrich Neumann's user avatar
4 votes
Accepted

Modeling experimental data with differential equations

Update ...
ydd's user avatar
  • 3,453
3 votes

Multiple solutions from NSolve

For parametric research it could be better to use FindRoot as follows ...
Alex Trounev's user avatar
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3 votes

Modeling experimental data with differential equations

This should help you underway, but I couldn't find good starting values for the parameters: ...
Sjoerd Smit's user avatar
  • 21.9k
2 votes
Accepted

Plotting an integral with solving for a specific constant

As an example, we take a simple function that we can integrate analytically: f[t_] = t + 2; Integrate analytically: ...
Roman's user avatar
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1 vote
Accepted

Using ParametricNDSolveValue and MultiNonlinearModelFit to fit an ODE system to datasets

I split the data values and uncertanties into two separate lists, and also grab the time values: ...
ydd's user avatar
  • 3,453
1 vote

Multiple solutions from NSolve

With the OP's sol, we can gather the similar solutions together, find their mean, and if desired, polish them up with FindRoot: <...
Goofy's user avatar
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1 vote

Multiple solutions from NSolve

Setting WorkingPrecision->20, it then takes 85 sec. and gives only 3 solutions, although it gives a warning that the input is less precise than working precision: ...
Daniel Huber's user avatar
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1 vote

Plot after applying NIntegrate

int is producing seemingly random numbers because AccuracyGoal -> 5, PrecisionGoal -> 4 are too small. Increasing the ...
bbgodfrey's user avatar
  • 60.7k
1 vote
Accepted

Find an instance satisfying equation

It seems there is no real solution in view of ...
user64494's user avatar
  • 24k

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