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
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 ...
- 600
1
vote
How to speedup calling the interpolation function?
Try purefunctionas Interpolation object
...
- 43.1k
Only top scored, non community-wiki answers of a minimum length are eligible