YALMIP

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Alternative discussion: https://github.com/yalmip/YALMIP/discussions

Welcome to the Google groups for everything related to YALMIP, solvers used by YALMIP, and modelling and optimization in a YALMIP context.

If your question involves code which crashes or similarly, please supply, if possible, fully reproducible code, i.e, code that actually runs and shows your problem. Try to reduce the code to something as simple as possible, while still illustrating your issue (i.e., preferably avoid sending complete library of code to setup the problem, use random data instead if possible, don't use a model with 5000 constraints when it crashes already on the first constraint, etc)

1. Make sure you are running the latest version of YALMIP (currently YALMIP R2023-06-22)

2. If you are debugging something: Simplify simplify simplify. Always reduce a problem as far as possible.

3. Surprised by infeasibility: https://yalmip.github.io/debugginginfeasible/

Don't forget to read the manual with examples and tutorials at the YALMIP homepage

0 selected

이민섭/학생/전기공학, Johan Löfberg10

10:20 AM

Modeling implications by multiplying binary variables with expressions is typically a very bad

unread,

Modeling implications by multiplying binary variables with expressions is typically a very bad

10:20 AM

jfaycel, Johan Löfberg4

May 10

I guess you have different solvers installed then, and one of them happens to return a non-zero

unread,

I guess you have different solvers installed then, and one of them happens to return a non-zero

May 10

Heman Shamachurn, Johan Löfberg9

May 10

MPC time varying constraints with Yalmip

It simply says you are sending the wrong number of parameters compared to how you defined the

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MPC time varying constraints with Yalmip

It simply says you are sending the wrong number of parameters compared to how you defined the

May 10

ju liu, Johan Löfberg3

May 10

can help me address the error of using bnb solver?

and your code is unnecessarily complicated with things like ones(1,m)*dw which is just sum(dw) and

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can help me address the error of using bnb solver?

and your code is unnecessarily complicated with things like ones(1,m)*dw which is just sum(dw) and

May 10

Dabbaghi boudour, Johan Löfberg4

May 8

I have no idea what you are saying. On Wednesday 8 May 2024 at 12:58:05 UTC+2 dabbaghu...@gmail.com

unread,

I have no idea what you are saying. On Wednesday 8 May 2024 at 12:58:05 UTC+2 dabbaghu...@gmail.com

May 8

김상훈, Johan Löfberg5

May 7

matlab demension problem for using yalmip

You will have to supply code that runs, ie effectively fix so that load BR_data_83.mat runs, or that

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matlab demension problem for using yalmip

You will have to supply code that runs, ie effectively fix so that load BR_data_83.mat runs, or that

May 7

解文, Johan Löfberg2

May 6

The second-order cone constraint is not satisfied

Your problem is badly scaled (gurobi warns about this), so when gurobi tries to fix this it leads to

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The second-order cone constraint is not satisfied

Your problem is badly scaled (gurobi warns about this), so when gurobi tries to fix this it leads to

May 6

Green Arthur, Johan Löfberg3

May 6

semi-definite constraints

Thank you so much Prof.Johan, I solved the problem. Best wishes. On Monday, May 6, 2024 at 5:12:31 PM

unread,

semi-definite constraints

Thank you so much Prof.Johan, I solved the problem. Best wishes. On Monday, May 6, 2024 at 5:12:31 PM

May 6

xiusi wang, Johan Löfberg5

May 6

How can I determine how YALMIP categorizes an optimization problem？

Thank you very much! 在2024年5月6日星期一 UTC+8 12:22:38<Johan Löfberg> 写道： sdpvar x [~,~,~,m]=export(

unread,

How can I determine how YALMIP categorizes an optimization problem？

Thank you very much! 在2024年5月6日星期一 UTC+8 12:22:38<Johan Löfberg> 写道： sdpvar x [~,~,~,m]=export(

May 6

farah dhandoko, Johan Löfberg2

May 6

I have an error in my code regarding to get a feasible solution in LMIs

the code does not run as linWD is missing However, the error message is very clearly telling you what

unread,

I have an error in my code regarding to get a feasible solution in LMIs

the code does not run as linWD is missing However, the error message is very clearly telling you what

May 6

qiang gao, Johan Löfberg2

May 5

How to impose constraints on a non-standard positive semi-definite matrix

A SOS constraint would be the natural approach in YALMIP. Conservative and scales horribly though On

unread,

How to impose constraints on a non-standard positive semi-definite matrix

A SOS constraint would be the natural approach in YALMIP. Conservative and scales horribly though On

May 5

Mehdi Tafazolli, Johan Löfberg2

May 4

solver does not support binary variables

Your weird/redundant introduction of the abs operator in a quadratic forces YALMIP to do MILP

unread,

solver does not support binary variables

Your weird/redundant introduction of the abs operator in a quadratic forces YALMIP to do MILP

May 4

gao bin, Erling D. Andersen2

May 4

how to express the function of 1/x*1/y^alpha

You can use a power cone https://docs.mosek.com/modeling-cookbook/powo.html#the-most-general-power-

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how to express the function of 1/x*1/y^alpha

You can use a power cone https://docs.mosek.com/modeling-cookbook/powo.html#the-most-general-power-

May 4

Rick Wang, Johan Löfberg6

May 3

Solution not changing with uncertainty set size

Debugging this will be a significant effort likely where I will have to find some cleaner case to

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Solution not changing with uncertainty set size

Debugging this will be a significant effort likely where I will have to find some cleaner case to

May 3

Erik van den Eshof, Johan Löfberg7

May 3

Possible to define variables as non-decision variables?

Those should compile without issues, so you would have to be more specific >> sdpvar xyz

unread,

Possible to define variables as non-decision variables?

Those should compile without issues, so you would have to be more specific >> sdpvar xyz

May 3

刘007, Johan Löfberg4

May 2

Generating constraints in the column-and-constraint generation algorithm

Still don't really understand your question. But as a generic answer, if you cannot parameterize

unread,

Generating constraints in the column-and-constraint generation algorithm

Still don't really understand your question. But as a generic answer, if you cannot parameterize

May 2

김상훈, Johan Löfberg4

May 2

ERROR) mosek does not support binary variables

Of course not, but to find your error, the code must be possible to run It still does not run as the

unread,

ERROR) mosek does not support binary variables

Of course not, but to find your error, the code must be possible to run It still does not run as the

May 2

杜昊明, Johan Löfberg4

Apr 29

0-1 variables of the inner problem

Indeed, I found a bug in the code that let's through binary decision variables in the kkt command

unread,

0-1 variables of the inner problem

Indeed, I found a bug in the code that let's through binary decision variables in the kkt command

Apr 29

JackJack, Johan Löfberg3

Apr 28

Best practice for using "fix" versus "assign" ?

Thank you so much ! I think I will use the replace command ! https://yalmip.github.io/command/replace

unread,

Best practice for using "fix" versus "assign" ?

Thank you so much ! I think I will use the replace command ! https://yalmip.github.io/command/replace

Apr 28

cillian bao, Johan Löfberg4

Apr 25

A problem with implies

Thanks for your replying and advice. 在2024年4月24日星期三 UTC+8 15:19:14<Johan Löfberg> 写道： and if

unread,

A problem with implies

Thanks for your replying and advice. 在2024年4月24日星期三 UTC+8 15:19:14<Johan Löfberg> 写道： and if

Apr 25

Xiao Wang, Johan Löfberg6

Apr 25

why my problem is non-convex MIQCP

Nope, it's as nonconvex as it can get Gurobi is a global solver. On Thursday 25 April 2024 at 02:

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why my problem is non-convex MIQCP

Nope, it's as nonconvex as it can get Gurobi is a global solver. On Thursday 25 April 2024 at 02:

Apr 25

Apr 24

Degenerate solutions in SDP

Hi professor, I recently encountered an optimization problem that can be solved using SDP. I used

unread,

Degenerate solutions in SDP

Hi professor, I recently encountered an optimization problem that can be solved using SDP. I used

Apr 24

Lorenzo Calogero, Johan Löfberg4

Apr 24

Issue with "blackbox" operator

I think the issue runs deeper than so, it appears R^n->R nonlinear operators fail when included in

unread,

Issue with "blackbox" operator

I think the issue runs deeper than so, it appears R^n->R nonlinear operators fail when included in

Apr 24

Seyyed Enjavi, Johan Löfberg5

Apr 24

MPC feasibility

Thanks for your help On Wednesday, April 24, 2024 at 3:40:45 PM UTC+3:30 Johan Löfberg wrote: Kothare

unread,

MPC feasibility

Thanks for your help On Wednesday, April 24, 2024 at 3:40:45 PM UTC+3:30 Johan Löfberg wrote: Kothare

Apr 24

Spitzkopf Larry, Johan Löfberg2

Apr 24

Problems witch "check" and "dual"

Impossible to answer with that little information dual being Nan means the problem wasn't solved,

unread,

Problems witch "check" and "dual"

Impossible to answer with that little information dual being Nan means the problem wasn't solved,

Apr 24

王修俟, Johan Löfberg6

Apr 23

The KKT command in YALMIP to extract Lagrange multipliers

weird, maybe I slipped duals and lagrangian multipliers are the same thing, and sign depends how the

unread,

The KKT command in YALMIP to extract Lagrange multipliers

weird, maybe I slipped duals and lagrangian multipliers are the same thing, and sign depends how the

Apr 23

xiusi wang, Johan Löfberg2

Apr 23

Page-wise matrix multiplication in yalmip

pagemtimes is essentially just syntactic sugar for a for-loop, so even if it was to be over-loaded it

unread,

Page-wise matrix multiplication in yalmip

pagemtimes is essentially just syntactic sugar for a for-loop, so even if it was to be over-loaded it

Apr 23

Sudheer Reddy boggadi, Johan Löfberg6

Apr 22

saving a customized sdpvar matrix

No, that is not a feature that will be added Pretty clear that it won't be symmetric, as you

unread,

saving a customized sdpvar matrix

No, that is not a feature that will be added Pretty clear that it won't be symmetric, as you

Apr 22

林博二, xiusi wang2

Apr 20

SDPVAR in zero matrix

you can use sdpvar abc rows = [1, 3, 4]; cols = [2, 3, 1]; vals = [a, b, c]; % spares matrix S =

unread,

SDPVAR in zero matrix

you can use sdpvar abc rows = [1, 3, 4]; cols = [2, 3, 1]; vals = [a, b, c]; % spares matrix S =

Apr 20

Sudheer Reddy boggadi, Johan Löfberg10

Apr 19

norm function in matlab

Hi Prof. Johan, I rechecked my code, got to know the problem, and can see the results now. Thanks for

unread,

norm function in matlab

Hi Prof. Johan, I rechecked my code, got to know the problem, and can see the results now. Thanks for

Apr 19

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