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# Bill Tubbs

Last seen: 4 días hace Con actividad desde 2020

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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How to avoid duplicating code in the constructor and a reset method of a class with class inheritance.

5 meses hace | 2 respuestas | 0

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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

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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

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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

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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

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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

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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

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

8 meses hace | 0

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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

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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

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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

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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

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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

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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