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**Feeds**

Question

How can a Simulink State Space block state be periodically reset?

In Simulink, can a State Space block's states be periodically reset, ie not just set on startup? If not, what alternative is t...

9 months ago | 1 answer | 0

### 1

answerQuestion

How to run two Simulink models at different rates, in the same workspace?

Is it possible to run two Simulink models at different rates, in the same workspace? I'm looking to run two identical models (o...

9 months ago | 1 answer | 0

### 1

answerQuestion

Discrete-time Simulink not matching Matlab Connect()

I'm trying to understand why my discrete-time Simulink feedback loops are seemingly far from Matlab's Connect() results. Per he...

9 months ago | 1 answer | 0

### 1

answerQuestion

Discrete Derivative block (Simulink) behaves differently than expected

I'm discretizing a known-working continuous system model that includes x state outputs from the simulink Varying State Space blo...

9 months ago | 1 answer | 0

### 1

answerLQI with time-delay system

"Did you set the Pade order (for linearization) value in the Transport Delay block parameters to a positive integer? If not, th...

10 months ago | 0

LQI with time-delay system

"The location of the delay(s) will also have different affects on the closed loop I/O response as well if the delay is on the fe...

10 months ago | 0

Question

LQI with time-delay system

Matlab's documentation mentions that state-space systems with dead-time (eg. plant or measurement delays) can be defined with ss...

10 months ago | 2 answers | 0

### 2

answersHow to add disturbance feedforward to LQI()

Thanks Paul. My question was confusing because i grammatically misunderstood something you wrote :) Your latest explanation said...

10 months ago | 0

How to add disturbance feedforward to LQI()

1) I have more to ask later :), but was hoping to clarify Matlab nomenclature first, since that may change my questions... "Def...

10 months ago | 0

How to add disturbance feedforward to LQI()

Thanks @Paul, that's useful. I didn't know that signal paths could be turned on and off as you showed in sampleBlock. Very handy...

10 months ago | 0

Question

How to add disturbance feedforward to LQI()

I'm seeing an issue where adding disturbance FF to an LQI system is not causing any performance increase -- even though in my Si...

11 months ago | 1 answer | 0

### 1

answerQuestion

Standalone Application Compiler for OSX

I'm confused on the process for generating a standalone application for OSX, using Application Compiler. I've read all the docu...

1 year ago | 1 answer | 0

### 1

answerQuestion

acker(): "Error using sym/poly". Why?

I'm trying to find the eigenvalues of a matrix H manually, where H represents some system dynamics. (The system is defined by ...

1 year ago | 2 answers | 0

### 2

answersManually compute LQI() gains using Algebraic Riccati Equation / Hamiltonian

Thanks @Paul. Good point about being able to use place() as well. The main question was this one: Is there a better manual m...

1 year ago | 0

Question

Manually compute LQI() gains using Algebraic Riccati Equation / Hamiltonian

I'm attempting to compile a Matlab program for embedded use, and that program also includes lqr() and lqi(). Since neither are c...

1 year ago | 2 answers | 0

### 2

answersQuestion

Simulink Switch doesn't propagate rate transition

How can I make a Simulink Switch to propagate rate transition? Right now I have two signal paths, of variable rates, with the r...

1 year ago | 1 answer | 0

### 1

answerQuestion

Extra zeros added to a TF by zero()

I'm seeing extra zeros added to a TF by zero(). Here's a state space TF, in zpk form (for compactness, as the SS form is large ...

1 year ago | 2 answers | 0

### 2

answersQuestion

Commenting out Simulink block changes in unrelated system

I have an issue where "Commenting Through" a Simulink block semmingly changes the response of an unrelated system. Say I have u...

1 year ago | 1 answer | 0

### 1

answerQuestion

Simulink Matrix multiply error: unexpected scalar signal mismatch

I'm confused by a Simulink error relating to a "mismatched port size". I have a scalar signal in a feedback loop -- the exact c...

1 year ago | 1 answer | 0

### 1

answerQuestion

Step() not working as expected with USS state space (Uncertain Sys)

I'm trying to figure out what step() is doing with uss (uncertain) discretized state space equations, for 2nd-order systems. Th...

1 year ago | 1 answer | 1

### 1

answerQuestion

How to tell if an object is an Uncertain state-space (USS) model?

I have a function that is overloaded, and takes both standard state space, and uncertain (uss) state space as inputs. Since c2d...

1 year ago | 1 answer | 0

### 1

answerQuestion

Adding InternalDelay for State Space system

Say I have a closed loop feedback system sys without any delays, represented as a state space system. It was 2 inputs: reference...

1 year ago | 1 answer | 0

### 1

answerlsim() vs step() : are different responses expected?

@Walter Roberson Thanks for verifying. I thought it was the same directory as well, ie it seems like the matching function is ca...

1 year ago | 0

Question

lsim() vs step() : are different responses expected?

Are different responses expected if running lsim() and step(), both with the same unit step inputs? I have a state-space system...

1 year ago | 2 answers | 0

### 2

answersQuestion

Discretize State Space feedback controller using c2d()

I'm looking to discretize a State Space feedback controller using c2d(), to find loop rate limits with which this feedback syste...

1 year ago | 1 answer | 0

### 1

answerIs there lqid() ? Lqr() has lqrd(), but I can't find lqid()

To answer my own question, after writing to mathworks: lqr() has lqrd(), but there isn't an equivalent for lqi(). lqi() is over...

1 year ago | 0

| accepted

Question

Is there lqid() ? Lqr() has lqrd(), but I can't find lqid()

Is there lqid()? Lqr() (continuous-time) has lqrd() (discrete-time), but I can't find lqid(). Is lqi() overloaded for discret...

1 year ago | 1 answer | 0

### 1

answerQuestion

Change rlocus() axis units to Hz?

How can I change the plotted rlocus() real axis units to Hz, vs rad/s? I tried Property Editor --> clicking on X axis --> More ...

1 year ago | 1 answer | 0

### 1

answerQuestion

Simulink error: Time-Varying State Space block

I have a Simulink error I can't figure out, relating to the Time-Varying State Space block dimensions. I'm using this block so...

1 year ago | 2 answers | 1

### 2

answersQuestion

LQG issue: state estimates always perfect

I'm working through an LQG controller for a simple 2nd-order spring/mass/damper system, using an LQR controller base. See my at...

1 year ago | 1 answer | 0