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**Content Feed**

Question

How to precisely place textarrow?

Inside a plot, I want to place several textarrows to mark specific events on the timeline. However, their placement is not very ...

3 månader ago | 1 answer | 0

### 1

answerHow to handle discrete, non-periodic right-hand side of ODE in Matlab

Since this was inspired by the valuable comment of Walter Roberson to my original answer, I am posting this solution as a separa...

mer än 2 år ago | 0

| accepted

How to handle discrete, non-periodic right-hand side of ODE in Matlab

After some research, I've found MathWorks official answer, and the corresponding paragraph from ode45 documentation. Note that i...

mer än 2 år ago | 0

Question

How to get algebraic solution and symbolic Jacobian of this simple equation?

I am trying to simplify this set of algebraic equations. Then, I would like to have Matlab calculate the Jacobian for me. But it...

ungefär 3 år ago | 1 answer | 0

### 1

answerTime dependent parameters in ode

Here is MathWorks official answer, and the corresponding paragraph from ode45 documentation. Note that interp1 does linear inte...

ungefär 3 år ago | 0

Question

How to use max inside Simulink Fcn block?

In my Simulink sheet, I have a Fcn block which does a very simple calculation from its input: u(36)/u(38)*u(39) Since the inpu...

ungefär 3 år ago | 1 answer | 0

### 1

answerQuestion

Why is nonlinear inequality constraint not respected by fmincon?

The following script uses fmincon for minimization and works as expected: % Feeding optimization over time, with algebraic mode...

mer än 3 år ago | 0 answers | 0

### 0

answersQuestion

Why is optimization involving ODEs so much slower than with a purely algebraic objective function?

Consider this optimization script, which is a very much boiled down version of something I am currently working on: % Parameter...

nästan 4 år ago | 0 answers | 0

### 0

answersQuestion

How to get only one or two output times from ODE solver?

I am programming a nonlinear optimization, during which an ODE is solved multiple times at each objective function call. So I wo...

nästan 4 år ago | 1 answer | 0

### 1

answerQuestion

What is causing Invalid variable 'conjugate(B(t))' in Symbolic Math Toolbox?

While trying to solve a DAE system with Symbolic Math Toolbox, I keep getting the same error. Unfortunately, the error message d...

nästan 4 år ago | 1 answer | 0

### 1

answerQuestion

Why do MINLP solvers have such a hard time with this simple problem?

I am trying to solve a global optimization problem, belonging to the category of MINLP (mixed-integer nonlinear programming). ...

mer än 4 år ago | 1 answer | 0

### 1

answerQuestion

How to dynamically manipulate input variables during simulation from within Simulink M-code S-function?

In Simulink, I am trying to setup the following problem: An ODE which right-hand side is depending on a discrete input value. ...

mer än 4 år ago | 0 answers | 0

### 0

answersQuestion

How to handle discrete, non-periodic right-hand side of ODE in Matlab

I am trying to migrate an existing Simulink simulation to pure Matlab, which is necessary for several reasons. It is a stiff sys...

mer än 4 år ago | 3 answers | 0