Answered
Concept of the null operator question
MATLAB does not allow arrays with empty elements. Double precision arrays are always nice rectangular things. So, for example, t...

5 years ago | 0

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Answered
Finding the sum of the first n primes and to use a while function
You stopped your while loop the wrong way. As it is, if you allow prime_count to be less than or EQUAL to n, then it adds ONE mo...

5 years ago | 0

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Answered
use vpasolve's engine without vpasolve
You cannot access vpasolve without using vpasolve. There is no way to access the code for vpasolve. You cannot use fminsearch o...

5 years ago | 0

Answered
Generate cell of random numbers with same size arrays
Simple enough. A = rand(15,200); B = mat2cell(A,repmat(5,3,1),repmat(100,1,2)); size(B) size(B{1,1}) class(B{1,1}) So B is...

5 years ago | 1

Answered
Is it possible to create an optimizableVariable of integer type as an array with step different from 1?
Suppose X is an integer variable, that takes on only the values 1:5. But what you want are non-integer levels of some paramete...

5 years ago | 1

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Answered
Divide a number N into K numbers
The dissection of an integer into a sum of integers is called an integer partition. Assuming these are integers in the sum, the...

5 years ago | 2

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Answered
how does double integration work
x = -100: 1/10:100; f = 6*x; first_integral_plot = cumtrapz(x, f); % Integration second_integral_plot = cumtrapz(x, first_int...

5 years ago | 1

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Answered
Readability of matlab code
AVOID GLOBAL VARIABLES. They will not improve your code. Intead they will make it difficult as hell to debug your code when ther...

5 years ago | 2

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I want to create normally distributed random variables, and refer to them as my independent variables
The answer is, DON'T. https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamic...

5 years ago | 0

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sum of elements of an array
B = cumsum(A); You could have learned about this function by reading the help for sum. At the bottom of the help, you would see...

5 years ago | 1

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results in the form of integral
Just wanting a result from some computation to have an analytical solution is not enough. Sometimes it requires additional mathe...

5 years ago | 0

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Answered
Symbolic Math is reordering my subtraction
syms x_k(t) y_k(t) L x_kD = diff(x_k,t) y_kD = diff(y_k,t) rRk = sqrt(x_k^2 + y_k^2) rTk = sqrt(x_k^2 + (y_k-L)^2) rRkD = ...

5 years ago | 0

Answered
How to reduce computation time of (sparse) matrix multiplication in Matlab?
The answer is easy. It depends! What does it depend on? How sparse are your matrices? A lot of people think if half the entries...

5 years ago | 1

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Answered
How to plot only the real solutions of an implicit function ?
First, look at what you have. R = 0.35; L = 0.25; H = 0.4; syms x y F = sqrt(L^2-(R*(cosd(x)-sind(x).*sind(y))-H).^2) The ...

5 years ago | 1

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Two equations of two unknown angles
First, I would recognize that you PROBABLY intended 200 to be a number in DEGREES, not radians. (200 radians would seem to make ...

5 years ago | 0

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Answered
Producing a NaN only where there is a NaN, zero otherwise
I'm always amazed at how many ways there are to accomplish anything in MATLAB. Here was my effort. It took me some time to think...

5 years ago | 0

Question

Producing a NaN only where there is a NaN, zero otherwise
This interesting question came up for me today. I was looking for a simple expression that can be used in a function handle, one...

5 years ago | 6 answers | 3

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answers

Answered
how to solve this question in Matlab
This is now, what, the third or 4th time you asked this question? The first few times, it was explicitly about your homework ass...

5 years ago | 0

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Answered
Reverse geometric progression algorithm
Since you want a symmetric set of points around 0, first generate a set on the positive side of the origin, then just flip them ...

5 years ago | 0

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Answered
Matlab: Divide and Average Method
Its that new math. The supreme court redefined sqrt(4) as 1.68 just recently. So your code is correct. Now all we need to do is ...

5 years ago | 0

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How to tell if a function was called from within Matlab or from system?
Perhaps you might try what are essentially different calls, where you pass information about WHERE your call is coming from. So ...

5 years ago | 0

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How can I slove the maxtric
You want to slove a matrix? Sorry. Valentines day was 3 days ago. Too late for s"love". A is a column vector, composed of the e...

5 years ago | 0

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Find an orthogonal vector
Never call a variable O. Consider how difficult it will be to find the bug one day, when you see or write a zero, instead of O. ...

5 years ago | 0

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Answered
Matlab does not show the curve equation in basic fitting
You misunderstand splines. A spline does not have a simple equation you can write down. And while in theory, you could write dow...

5 years ago | 0

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How do I determine the linear part of a force-displacement curve?
You have already accepted Star's answer, so you may not even see this answer. But in fact, there is no linear part of such a cur...

5 years ago | 3

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Fitting data to a polar equation
@Omar Ashour It seems from this last comment that you re making some progress. There are some points I should make. First, wh...

5 years ago | 0

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Answered
why isn't determinant function working?
I think your problem may be due to the imaginary part of this rather nasty function. F = matlabFunction(DET1); F(1) ans = ...

5 years ago | 0

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Fitting the data to power law using least square method
Let me look more carefully at your data, as there are some thigns that REALLY bother me about the approach you wish to use, as w...

5 years ago | 0

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Correspondence between optimization outputs and symbolic variables
The problem lies in your code. First, you have an obvious error in the code you show. I'll guess you just used too many or too f...

5 years ago | 0

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Which equation does Matlab use to fit a Normal distribution?
I think you misunderstand, as there are several things happening here. A normal distribution fit, that is, finding the paramete...

6 years ago | 1