Community Profile

photo

Bill Tubbs


Last seen: 4 días hace |  Con actividad desde 2020

Statistics

  • Thankful Level 4
  • Revival Level 2
  • 3 Month Streak
  • First Answer
  • First Review

Ver insignias

Content Feed

Ver por

Respondida
Rearrange Variables in an equation
As explained here by Paul, you can use the isolate function for this: >> syms a b >> eqn1 = b == (1 - a) / 2; >> isolate(eqn1...

4 días hace | 0

Pregunta


How to simply rearrange a symbolic equation to get an expression for one variable in terms of others
I'm building differential equations symbolically and ran into an error when doing a simple re-arranging of an equation. For exa...

4 días hace | 1 respuesta | 0

1

respuesta

Respondida
Specifying bounds in process model estimation
Not necessarily. You only need bounds if you think your model is overfitting the data (e.g. due to not enough data points and/o...

alrededor de 1 mes hace | 0

Pregunta


Test of whether matrix is Symmetric Positive Definite is giving wrong result when matrix is not symmetric
I'm computing a multivariate normal probability density with an estimated covariance matrix as follows: % Update the conditiona...

3 meses hace | 2 respuestas | 0

2

respuestas

Respondida
How to make an array of alternating 1 and -1?
Even easier: out = cumprod(-ones(1, 12)) out = -1 1 -1 1 -1 1 -1 1 -1 1 -1 1

3 meses hace | 0

Respondida
How to make an array of alternating 1 and -1?
Here's another way. A geometric series: out = (-1).^(0:11) out = 1 -1 1 -1 1 -1 1 -1 1 ...

3 meses hace | 0

Pregunta


Confusing description of built-in estimator noise model on MPC documentation page
I'm confused by the following text which appears on the documentation page: 'Implement Custom State Estimator Equivalent to Buil...

4 meses hace | 0 respuestas | 0

0

respuestas

Pregunta


How to assign values to MV Targets of MPC object from cell array
I'm having a tough time trying to assign 3 values to the parameters of an mpc object. Here is my MPC object with it's current v...

4 meses hace | 1 respuesta | 0

1

respuesta

Respondida
Advice on adding a manipulatable variable target to MPC
As usual, I figured it out a few minutes after posting this question! It actually says this in the documentation page I linked ...

4 meses hace | 0

| aceptada

Pregunta


Advice on adding a manipulatable variable target to MPC
I've designed an MPC in MATLAB using the mpc function and successfully simulated it in Simulink using the MPC block in closed lo...

4 meses hace | 1 respuesta | 0

1

respuesta

Respondida
Trying to understand dimensions of state estimates output of MPC block in Simulink
I figured out that you can use the following to get all the parameters of the Kalman Filter including the augmented model used b...

4 meses hace | 0

| aceptada

Pregunta


Trying to understand dimensions of state estimates output of MPC block in Simulink
I'm running an MPC in Simulink that was defined in a matlab script using the MPC Controller block and I want to inspect the stat...

4 meses hace | 1 respuesta | 0

1

respuesta

Respondida
How do I calculate the static Kalman gain (= steady-state Kalman gain)?
In addition to my answer above, I just discovered a special function for Kalman estimator design called dlqe in the Control Syst...

5 meses hace | 0

Respondida
How do I calculate the static Kalman gain (= steady-state Kalman gain)?
For the record, I found a way to do it using the idare function (see this material online: hw5sol.pdf from S. Boyd). This is fo...

5 meses hace | 0

Respondida
How to avoid duplicating code in the constructor and a reset method of a class with class inheritance.
I found one solution. If you put the reset code in a static method, you can call it from within the constructor. Not sure if th...

5 meses hace | 0

Pregunta


How to avoid duplicating code in the constructor and a reset method of a class with class inheritance.
FYI, I asked a similar question about this problem before but did not get a satisfactory answer so I'll ask it in a different wa...

5 meses hace | 2 respuestas | 0

2

respuestas

Respondida
Find index to rows of one matrix in another
I figured out the answer: >> [~, idx] = ismember(B, A, 'rows') idx = 1 3 2 2 In case you want to check that all row...

5 meses hace | 0

| aceptada

Pregunta


Find index to rows of one matrix in another
Suppose I have two matrices: >> A = eye(3) A = 1 0 0 0 1 0 0 0 1 >> idx = [1 3 2 2]; >> B =...

5 meses hace | 1 respuesta | 0

1

respuesta

Pregunta


Reset method being called twice during instantiation of a class instance with inheritance
I'm defining various classes with an inheritance hierarchy and having problems setting up each class's reset method so that it i...

6 meses hace | 1 respuesta | 0

1

respuesta

Respondida
How to extract matches from results of a regexp match
Here is a one-line solution—it's based on the answer of Stephen23 but instead of finding the matches, it finds the first indeces...

8 meses hace | 0

Pregunta


How to make an inherited immutable super class property mutable in the sub-class?
I have a class which has immutable properties and I want some sub-classes to be able to modify these properties. Obviously it r...

8 meses hace | 1 respuesta | 0

1

respuesta

Pregunta


Strings are converted to cells during readtable
I am incrementally saving data to a csv file which includes strings: data = table("string1", "string2"); writetable(data, "dat...

8 meses hace | 2 respuestas | 0

2

respuestas

Respondida
How do I create one legend for several subplots?
This is a good answer: Raghu S on 30 Aug 2018

8 meses hace | 0

Pregunta


How to extract matches from results of a regexp match
I'm trying to find the columns of a table that match a pattern. This works: col_names = {'X_est_9', 'X_est_10', 'Y_est_9', 'Y...

8 meses hace | 3 respuestas | 0

3

respuestas

Pregunta


Is there a built-in function to validate a class property that should be a cell array?
I'm new to classes and learning about how to define properties and validate their values. I have a class with a property A that...

8 meses hace | 3 respuestas | 1

3

respuestas

Respondida
how to display the results from simulink in a table
I also prefer working with tables and csv files rather than mat files so I wrote a script to convert a Simulink SimulationOutput...

10 meses hace | 0

Pregunta


Simulink vector index assignment / re-ordering using Selector block
I'm trying to merge two vector signals into one vector according to two sets of indices. For example: u_pos = [2 3 4]; du_p...

11 meses hace | 1 respuesta | 0

1

respuesta

Respondida
Find in a cell array?
Just in case someone comes here looking to do this with a cell array of chars as I was, it's quite easy this way: my_cell_array...

12 meses hace | 3

Respondida
How to add a parameter value to the icon of an S-function block
Based on the comments in response to Benjamin's answer, here is the complete and concise answer to the question: First create a...

12 meses hace | 0

| aceptada

Pregunta


How to add a parameter value to the icon of an S-function block
I'm new to S-function blocks in Simulink but I've made a working S-function block and now I want to display a value on its icon....

12 meses hace | 2 respuestas | 0

2

respuestas

Cargar más