Community Profile

photo

Steve Grikschat


MathWorks

36 2011 이후 총 참여 횟수

담당자

Steve Grikschat's 배지

  • Personal Best Downloads Level 1
  • First Review
  • 5-Star Galaxy Level 2
  • First Submission
  • 3 Month Streak
  • Revival Level 1
  • Knowledgeable Level 2
  • First Answer

세부 정보 보기...

참여 게시물
보기 기준

답변 있음
surrogateopt function's parallel option with a parallel objective function
Hi Andrea, Your observation is correct. Parallel Computing Toolbox only supports 1-level of parallelism. https://www.mathwo...

4달 전 | 0

| 수락됨

답변 있음
Huge overhead in fsolve due to fsolve>createExitMsg()
An update: This was changed in all solvers in R2018a. Now, the message is not made if it is not requested, i.e. if options.Dis...

9달 전 | 0

| 수락됨

답변 있음
Error in parfinitedifferences using fmincon and parallel
This is a bug in the R2013b Optimization Toolbox. See the report here: <https://www.mathworks.com/support/bugreports/963073 Bug...

1년 이상 전 | 1

| 수락됨

제출됨


AMPL Interface to MATLAB
Connect MATLAB - Optimization Toolbox™ to the AMPL API for MATLAB

1년 이상 전 | 다운로드 수: 10 |

답변 있음
fmincon with trust-region-reflective algorithm converges but interior point doesn't
What exactly does I-P return? Does it declare the problem infeasible? Does it time out? It might help others to post some output...

1년 이상 전 | 1

| 수락됨

답변 있음
No feasible solution found when using intlinprog
If you are referring to intermediate feasible solutions you can use the built-in |OutputFcn| |savemilpsolutions|: <https://ww...

1년 이상 전 | 1

| 수락됨

답변 있음
Why is lambda as an output of fmincon empty?
Hi Viswanath, The lambda output is empty since the algorithm was stopped prematurely by the OutputFcn. When that happens, ...

1년 이상 전 | 3

| 수락됨

답변 있음
Reformulate a Constrained Linear Least Square Problem
You can try a trick from Lawson & Hanson and re-formulate to a minimal distance problem and solve via |lsqnonneg|. |lsqnonneg| i...

1년 이상 전 | 2

| 수락됨

답변 있음
gamultiobj failure when starting with a whole feasible population
Hi, From the stack trace, you can see that the solver calls the fitness function with a row vector. It should be a 1-by-nvars...

2년 이하 전 | 0

| 수락됨

답변 있음
DerivativeCheck and finite differencing in lsqcurvefit/lsqnonlin
Hi Matt, Your assessment is correct in that the step-size is determined relative to the scale of the variables (columns of J)...

4년 이하 전 | 0

| 수락됨

답변 있음
What does this lsqnonlin error mean?
This error is occurring because your function is returning arrays of varying sizes. In this case, it is being caught during fini...

약 6년 전 | 1

| 수락됨

답변 있음
What does this Fmincon error mean?
This is a bug with the parallel finite differences approximation code. In particular, how this feature works with "invalid" valu...

6년 이상 전 | 1

답변 있음
Generating iterations from Genetic Alogrithim
Do you have the Global Optimization Toolbox? That's the first step if you want to use GA. See this about GA: <http://www.mat...

약 7년 전 | 0

답변 있음
Problem with subfunction within lsqnonlin??
All values returned to lsqnonlin must be of data type double.

약 7년 전 | 0

답변 있음
PCA by optimization
Hi MJ, Optimization toolbox functions will minimize over "X" where X can be a matrix or vector. Internally, matrices get flat...

7년 이상 전 | 0

답변 있음
Fixed Charge Network Flow Model Problem
Here's a basic LP example that shows how to use linprog (the LP solver in Optimization Toolbox): http://www.mathworks.com/help/...

7년 이상 전 | 0

답변 있음
UPDATING Upper and Lower Bounds in MultiStart Optimization
It seems like you want to solve several different problems. Each time you change the bounds, the optimization problem is differe...

7년 이상 전 | 0

| 수락됨

답변 있음
problem with fsolve - unpredictable results with long data vectors
I'm not sure what exactly is going on here. Fsolve seems to be finding a solution in both cases, correct? Since the system is sq...

7년 이상 전 | 0

답변 있음
blackbox function
Just to close the thread, the answer is given by Alan and others here: http://www.mathworks.com/matlabcentral/newsreader/view...

7년 이상 전 | 0

| 수락됨

답변 있음
optimization problem solution: [500x12000].X = [500x1] ??
Here's a suggestion I posted over at the newsgroup: The default algorithms for both lsqlin and quadprog accept sparse matrice...

8년 이하 전 | 0

| 수락됨

답변 있음
Quadratic optimization with quadratic constraints
Hi Rene (sorry, can't get the accent right) You can use FMINCON to solve this problem. However, there is no dedicated input f...

8년 이하 전 | 0

| 수락됨

답변 있음
fmincon not optimizing over one variable
It may appear to fmincon that the function has a zero derivative with respect to the variable in question. How sensitive is your...

8년 이하 전 | 1

답변 있음
Quadprog - dependent rows in constraint matrix
Is A for your inequality constraints or equality constraints? Also, it may depend on the algorithm. If you have redundant ine...

8년 이하 전 | 0

답변 있음
Lower and Upper bounds in LSQNONLIN
The start point is one of a few things you can change to influence the solver. There are other options (tolerances, etc) that ma...

8년 이하 전 | 0

답변 있음
option to stop lsqnonlin when residual norm value reached
Hi Tony, There are no tolerances to stop lsqnonlin when the residual norm crosses a threshold. What you can do instead is set...

약 8년 전 | 2

답변 있음
Slacktol value ?
If anyone else checks this, know that the problem given above is infeasible and the solution is erroneous. It's not recommen...

약 8년 전 | 0

답변 있음
Interior-point in fmincon without inequality constraints
You're correct, without inequalities, the interior point algorithm is a fairly straightforward algorithm. In the case where your...

약 8년 전 | 0

| 수락됨

답변 있음
Unconstrained Optimization with Additional Parameters
We've yet to see your code for the analytical gradient calculation (hopefully we don't ;) ). I suspect that the error might be t...

약 8년 전 | 0

답변 있음
Optimization with a vector of penalty functions
Hi Oliver, I think that fmincon is struggling with this for two reasons. fmincon is meant to work on smooth-continuous proble...

8년 이상 전 | 0

| 수락됨

답변 있음
Strict inequalities in fmincon
Effectively, you're defining a new strict inequality A*x <= b-e where "e" can be arbitrarily small. As the cyclist pointed out, ...

8년 이상 전 | 0

Load more