Answered
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 ...

3 years ago | 1

Answered
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...

3 years ago | 2

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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 ...

3 years ago | 1

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Answered
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 ...

3 years ago | 0

Answered
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...

3 years ago | 0

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Answered
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...

3 years ago | 0

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Answered
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...

3 years ago | 0

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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...

3 years ago | 0

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Answered
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...

3 years ago | 0

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I am supposed to write a cod to show a given numebr in two elements ; power of 2 and muliple of 5 i.e: nu=2^x+5*y or nu=2*x-5*y
Since you have written some code, at least tried to show an effort, I will give you a couple of hints. First, you will not be a...

3 years ago | 1

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Can anyone duplicate my matlab crash?
No problem encountered on two machines, but I don't have that release on my machine, and I think it is probably too old to run o...

3 years ago | 1

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systems of equations, with constraints
This is a question more about understanding the mathematics of the problem, than of understanding how to solve it in MATLAB. Unt...

3 years ago | 1

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Answered
How to describe a function with a sum of discrete values?
Just use cumtrapz to perform the cumulative integral. help cumtrapz

3 years ago | 0

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Answered
change class syms to double
If your sym variable still contains ANY symbolic parameters, then nothing can change it to a number. A double connot store a sym...

3 years ago | 0

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Answered
Generating random points between two n-dimensional boxes
In 2-dimensions, I posted a solution on the FEX that would work. But 2-d is trivial. You triangulate the domain, then generate r...

3 years ago | 0

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Answered
Adjust the parameter of the Uniform Random Number Module
rand ALWAYS generates numbers in the interval (0,1). ALWAYS. You cannot change that. However, if you bother to read the docs for...

3 years ago | 0

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how to convert a real number/or integer into fixed number of bits?
I'm confused, by a confusing question. You want to convert a real number into a representation as a fixed number of bits, so co...

3 years ago | 1

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Answered
find maximum distance between a point (outside of polygon) and a polygon?
You DON'T need QUADPROG!!!!!!! There is no need to quadratic programming to solve the maximum distance to polygonal region. Al...

3 years ago | 0

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Answered
Why some points do not satisfy the condition?
So often this mistake is made. Are those the EXACT values of those coefficients? To me, that would seem a surprise, that they we...

3 years ago | 0

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How to repeat a vector over and over?
So write a function that does it for you. vec = 1:4; repvec(vec,7) vec = [0;1]; repvec(vec,8) function newvec = repvec(vec,...

3 years ago | 1

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Answered
Pentadiagonal matrix to solve for Pressure variable
WHY? Don't write code to do what was already written well by world class experts in linear algebra. You are using MATLAB. So use...

3 years ago | 1

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I cannot the error in the bisection method...
Get used to using the dotted operators for some things. That allows MATLAB to use vectorization in tools like fplot. f = @(x) x...

3 years ago | 0

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Answered
Hello! How to define on which plane lies a given point with coordinates? I have coordinates of plane and normal
Does a point lie in a plane? This is quite easy to do. The equation of a plane is a simple one. In fact, it works in any number...

3 years ago | 0

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Question

Should equationsToMatrix handle inequalities?
equationsToMatrix is a very nice tool. It works great to unpack an equality relation, like this: syms x y EQ = x + 2*y == 3 [...

3 years ago | 1 answer | 0

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answer

Answered
polynomial curve fitting error
Is there a good reason why you called the script you wrote polyfit? Yes, I suppose you had a very good reason, because you wan...

3 years ago | 0

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Answered
How I can check if planes are parallel to each other in 3d?
planes(:,:,1) = [0 3 3; 0 0 3; 0 3 0; 0 0 0; 0 0 0]; planes(:,:,2) = [0 0 3; 3 0 3; 0 0 0; 3 0 0; 0 0 0]; planes(:,:,3) = [3 0...

3 years ago | 2

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Answered
What is the command for calculating expectation in MATLAB?
As a hint, generally, expectation and mean are terms with a similar meaning. Is there a function in MATLAB to compute a mean?

3 years ago | 0

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Answered
How can I restore image if I need to use command "interp2"
What does restore mean to you? Does it mean to some how recover the exact original image, after having interpolated it to some ...

3 years ago | 0

Answered
Write a Gauss-Seidel preconditioner for ML
Learn what a sparse matrix is. And how to build them, how to use them. help sparse help spdiags The point being, you don't wa...

3 years ago | 0

Answered
3D Surface of revolution from a 2D perimeter
Ok. (I should probably write code to do this in general, for any arbitrary polygon.) Quad elements. I'll show how to do it for ...

3 years ago | 0

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