Search Results
| Search type | Search syntax |
|---|---|
| Tags | [tag] |
| Exact | "words here" |
| Author |
user:1234 user:me (yours) |
| Score |
score:3 (3+) score:0 (none) |
| Answers |
answers:3 (3+) answers:0 (none) isaccepted:yes hasaccepted:no inquestion:1234 |
| Views | views:250 |
| Code | code:"if (foo != bar)" |
| Sections |
title:apples body:"apples oranges" |
| URL | url:"*.example.com" |
| Saves | in:saves |
| Status |
closed:yes duplicate:no migrated:no wiki:no |
| Types |
is:question is:answer |
| Exclude |
-[tag] -apples |
| For more details on advanced search visit our help page | |
Results tagged with mathematical-optimization
Search options not deleted
user 6358
Questions on the optimization functions of Mathematica such as FindMinimum/FindMaximum, Minimize/Maximize, NMinimize/NMaximize, etc.
12
votes
1
answer
365
views
Bug in NMaximize in 12.2?
Bug introduced in 12.2, Fixed in 12.3
Something changed in NMaximze in v12.2:
NMaximize[E^(-x^2) - 1, x]
(* {(-1 + E^#1)[0.], {x -> 0.}} *)
v12.1 works as expected:
NMaximize[E^(-x^2) - 1, x]
(* {0., …
- 20.4k
8
votes
FindMinimum works only if you know the answer
This is more of an extended comment than an answer. First, building off @JackLaVigne's work, I think it's better to work in log of your parameters, so I defined a new objective function
chiSquared2[ …
- 20.4k
6
votes
4
answers
712
views
MaxDetect speed
What's the fastest way to find the local maxima of a 2D list? E.g.
nx = ny = 100;
dat = Table[Sin[2. \[Pi] x/nx] (0.1 + Cos[2. \[Pi] y/ny]), {y, 0, ny}, {x, 0, nx}];
ListPlot3D[dat]
This (updat …
- 20.4k
6
votes
Accepted
Colouring Bifurcation Diagram
You can use ContourPlot to make such 1D bifurcation diagrams easily as in this answer, using ConditionalExpression to handle the stability analysis. I assume g[x, r] is some kind of potential, not x' …
- 20.4k
4
votes
Accepted
Plotting maxima within a simplex
Piggybacking on @kglr's answer, but using a right triangle rather than equilateral, so we can see p and q on the axes and to highlight the symmetry between f and h.
How about:
Plot3D[max[p, q], {p, …
- 20.4k
2
votes
Accepted
Solving for the coefficients in a nonlinear equation according to constraints
This can be solved by choosing a few arbitrary values of θ:
FullSimplify[
Solve[0 == E^t (a x^2 + b y^2 + c z^2)
/. {x -> r Cos[θ], y -> r Sin[θ], z -> m} /. θ -> {0, 1, 2}, {a, b}]]
(* {{a -> …
- 20.4k
1
vote
How to extract the last output from the Maximize
All of the answers in @kglr's comment work:
nm = Maximize[{x^0.5 - 2*y^3, 0 < x < 1, 0 < y < 1}, {x, y}];
y /. Last[nm]
y /. nm[[-1]]
nm[[-1, -1, -1]]
(* 0.000023912 *)
(* 0.000023912 *)
(* 0.0000239 …
1
vote
Solve / brute-force for parameters that drive a function to zero at specified points
I have no idea on your actual problem, but your simple example can be solved by choosing a few arbitrary values of θ:
FullSimplify[
Solve[0 == E^t (a x^2 + b y^2 + c z^2)
/. {x -> r Cos[θ], y - …