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Positive definite and LQR
R = 1; C = [0 0 1]; Q1 = 25*C'*C; N = zeros(3,1); matrix = [Q1 N;N' R]; The matrix Q1 has rank 1. You formed it from a vect...

alrededor de 3 años hace | 1

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How do I simplify polynomial coefficients with symbolic variables to the least possible forms?
The simplest form in your eyes is not always what a computer sees as the simplest form. It may require factoring the polynomial ...

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Smoothing a distribution curve
The distributions you show are not at all unsmooth. And they don't look at all uncommon for problems of that kind. So I'm not su...

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how can i see the steps in ref and rref.
You can't really. But you could, sort of. For example, you could use the debugger, and trace through the code as it runs on your...

alrededor de 3 años hace | 0

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How to solve a singular matrix problem?
Probable user error. How can you solve it? Almost always with a FEM problem, a singularity arises when you have made a mistake....

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How to find max value for a function between 2 specified values
Use fminbnd. fun = @(x) sin(x); [xloc,fval] = fminbnd(@(x) -fun(x),0,pi); xloc maxval = -fval So the maximum arises at x==p...

alrededor de 3 años hace | 0

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Find combination of 12 matrix rows, fulfilling certain criterion, from matrix of size 3432 *7
Finding all possible computations there are would be a computationally hard problem, certainly if you used brute force. It would...

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Find (local?) maxima when two maxima are adjacent to each other (maybe using islocalmax or findpeaks?)
help islocalmax Now, look carefully at the elements of that array. freq = [37 37 23 1 1 1]; m = islocalmax(freq) Is element ...

alrededor de 3 años hace | 0

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How to use lsqnonlin with multiple constraints?
These are not so much constraints, as bounds. They are simpler things. lsqnonlin allows bounds, but not equality or inequality c...

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Count all pairwise interactions in a matrix
If you have only one row, then it is trivial. Just use nchoosek. Row = [2 3 5 7]; Row(nchoosek(1:4,2)) But you have multiple ...

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Can anyone please help me with PSAT 1.34 software
What is the problem? You can download it. http://faraday1.ucd.ie/psat.html It appears the documentation is not available for ...

alrededor de 3 años hace | 0

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Different ways to solve a problem based , non linear function (sum(K.^2) -K is a 20*1 matrix) problem with linear equality constrains and having binary, continuous variables
None of the optimizers in the optimization toolbox (except for intlinprog, which handles only linear problems, so it does not ap...

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How to create a surface plot having 3 vectors?
Without knowing what your data looks like, it is difficult to help. And we don't see any data. For example, do you think that s...

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How to calculate the volume of trisurf?
If the points are on a sphere, thus a convex object, then a convex hull is what you want, not Crust anyway. Crust will allow the...

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Asymmetric intervals built-in vectorisation
You can decide that some syntax is what you want to have work, but there are limits. And I would no be surprised if someone else...

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How to get a line from two points collected using ginput
You aparently know how to use polyfit. But it seems you do not understand what it returns. x = 1:5; y = [2 3 5 7 11]; P1 = po...

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how to use ones to make an array with size determined from a large number listed in scientific notation?
9.4500e+4 is not even remotely a very large number. Relatively small really. And that means you should verify it is an integer. ...

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What does this operation do in matlab?
var2 is used as an index. It extracts the corresponding element of var1, thus creating var3.

alrededor de 3 años hace | 0

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How do I solve for the value of a constant to make a system consistent?
syms w Q = [0, 3; 1, 5; 0, 4; 1, -2] c = [3; 6; 4; w] So you have a matrix Q, and a vector c. Can you find w, such that the p...

alrededor de 3 años hace | 1

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Calculate the temperature distr
Little to say about the code. Does it compute the correct result? If it does, then it is code, code that works. Why do you need ...

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Modify code of straight circular cone to get a slate one
Assuming you mean a skewed cone, this is simple to do. You already know how to use the cylinder function. help cylinder A cone...

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I want to calculate pi^2 to 22 decimal places
As a strong suggestion, you want to do some reading here: https://en.wikipedia.org/wiki/Approximations_of_π Again, you CANNOT ...

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How to fit a biexponential decay function
First, NEVER set up a solver to fit exponential models with the SAME initial rate parameters for both terms!!!!!!!! So this is f...

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Constraining fit via function value instead of coefficient values
No. You cannot use fit to perform such a fit, where you place a constraint on the function values. And, yes, a polynomial is a ...

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Meaning of square bracket
You probably need to do the basic MATLAB onramp tutorial, as this should be covered there. And it is free. But this is how you ...

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how to speed up symbolic integration or turn this to numerical integration
As a suggestion, it is not at all uncommon to use a Gauss-Legendre quadrature for these things. Why? The kernel should be polyn...

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How to obtain argument value of an equation
I wrote an allcrossings tool, that I posted on the file exchange. I've attached it here. https://www.mathworks.com/matlabcentra...

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Why does cumtrapz give lower magnitude for very thin Gaussian?
As @the cyclist tells you. I would suggest you accept his answer as the correct one. I'm posting an answer here, as opposed to a...

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Trapezoidal quadrature weights from nodes
Hmm. Why not just call trapz? (A suspicious mind here, as this is too easy a question, and there are few good reasons why you ne...

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Find distance between a circle and a polygon?
This is clearly homework, of some sort, if you NEED to find those speciific parameters. As such, you need to make an effort. Bu...

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