
Bill Tubbs
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Content Feed
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...
1 month ago | 0
Question
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 months ago | 2 answers | 0
2
answersHow 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 months ago | 0
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 months ago | 0
Question
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...
3 months ago | 0 answers | 0
0
answersQuestion
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 months ago | 1 answer | 0
1
answerAdvice 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 months ago | 0
| accepted
Question
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 months ago | 1 answer | 0
1
answerTrying 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 months ago | 0
| accepted
Question
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 months ago | 1 answer | 0
1
answerHow 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...
4 months ago | 0
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...
4 months ago | 0
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 months ago | 0
Question
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 months ago | 2 answers | 0
2
answersFind 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 months ago | 0
| accepted
Question
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 months ago | 1 answer | 0
1
answerQuestion
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 months ago | 1 answer | 0
1
answerHow 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...
7 months ago | 0
Question
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 months ago | 1 answer | 0
1
answerQuestion
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 months ago | 2 answers | 0
2
answersHow do I create one legend for several subplots?
This is a good answer: Raghu S on 30 Aug 2018
8 months ago | 0
Question
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 months ago | 3 answers | 0
3
answersQuestion
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 months ago | 3 answers | 1
3
answershow 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 months ago | 0
Question
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 months ago | 1 answer | 0
1
answerFind 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 months ago | 3
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 months ago | 0
| accepted
Question
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 months ago | 2 answers | 0
2
answersQuestion
How to store structs and cell arrays of matrices in an S-function's Dwork memory.
I implemented a sophisticated multi-model process observer in MATLAB code using struct objects for convenience. Each struct has ...
12 months ago | 0 answers | 0
0
answersQuestion
Find the minimums along 3rd dimension of an array
I have a 3d array that is constructed from two 2d arrays: a = [1 2 3; 4 5 6; 7 8 9]; b = [1 2 0; 4 0 9; 9 8 9]; c = cat(3,a,b...
1 year ago | 1 answer | 0