6
votes
Accepted
5
votes
5
votes
Accepted
0-1 test or Lyapunov exponent, to prove my below system is chaotic?
I'll assume you're using the LyapunovExponents function I wrote here. The first step is to make sure you're starting on the attractor. In your case, it seems that ...
- 19k
4
votes
Forcing NonLinearModelFit to be positive
nlmf = NonlinearModelFit[mydata, {c x + a x^2, c >= 0}, {a, c}, x]
This constraint $c \ge 0$ comes from analyzing the derivative of the model: $df/dx = c + 2 a ...
- 9,243
2
votes
2
votes
Solve can’t solve this… is there a way to approximate it?
If you just want a numerical answer for $r$ given some values of $A$, $p$, and $n$, then FindRoot will do what you want. Example:
...
- 13.9k
1
vote
Plotting natural log equation in 3D plane
Perhaps, you meant something like this?
One can grab and rotate the image to the desired viewpoint.
From what you said, I guess that you wanted the $y$ axis to be vertical. I selected and assigned a ...
- 495
1
vote
Solve can’t solve this… is there a way to approximate it?
It is not clear whether a series approximation to be used in Excel or a Mathematica solution is desired.
How do I calculate mortgages and loans using annuities?.
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- 495
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