Answered
Solve ill-conditioned linear systems
The determinant of a matrix is completely, totally irrelevant. Yes, I know you were taught that if it is zero, then the matrix i...

2 years ago | 0

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Answered
Adjusting Convex Hull Area
I fail to see the issue. No, you cannot adjust how a convex hull computes the area. A convex hull does not see pixels. It sees t...

2 years ago | 0

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How to calculate real roots of a polynomial equation under square root ?
syms t real coupler_parametric=[5163136522924301/2251799813685248,... 2^(1/2)/2 - (8*t)/(t^2 + 1), - (4*(t^2 - 1))/(t^2 + ...

2 years ago | 0

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Answered
Find approximate solution of equation
Is there some general method, to ALWAYS be able to approximate the solution of a large system, and have a reliable result? No. O...

2 years ago | 0

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[0:0.1:1] whys is not exactly 0.1 steps ?
Can you represent the number 0.1 exactly? Remember that MATLAB does not store the exact representation of numbers. Instead, it u...

2 years ago | 2

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How to stop quadratic formula calculator from giving inverse outputs?
The roots of the quadratic you supply are indeed 6 and -3. roots([1 -3 -18]) So your code worked correctly. If you expected ...

2 years ago | 1

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hyperpca applied to a set of several hyperspectral images
You cannot combine multiple PCA analyses. Since each one requires the computation of the eigenvalues and eigenvectors of a matri...

2 years ago | 0

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Simpson integral - problem with writing the formula
a is a scalar. At least, it should be, based on how you show the code was called. If so, then why have you done this? dI = f(a(...

2 years ago | 0

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If I have an array and I need to find an element in the array how do I go about it?
I think you are confusing things, not understanding there is a difference between the number 110, and the vector [1 1 0], and th...

2 years ago | 0

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Answered
Matlab Predict function is not efficient
No code is ever as fast as users want. If you know how to make it faster, then write your own version. If your version really is...

2 years ago | 0

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Equally spaced points along a nonlinear path
Simpler yet, just download my interparc from the file exchange. It allows you to do the operation in a variety of ways, using se...

2 years ago | 1

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Converting between x,y cartesian variables to angle in symbolic variables
No, the toolbox will never try to understand your equations, and then infer what the variables mean to you, and then perform sub...

2 years ago | 0

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how write a matrix with specific features
I think you are confused about what you can do with MATLAB. Those constraints simply tell you the associated matrix for the grap...

2 years ago | 1

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I have a nonlinear equation with a symbolic variable and cant solve it.
Look carefully at your problem. n = 2.1; alpha0 = 0; syms p alpha eqn = p^(n+1) - alpha0*p^n + p -(alpha0 + alpha) == 0 So ...

2 years ago | 0

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Answered
findging eigenvectors with eigenvalues
Most of the time when I see someone worry their eigenvectors are not correct, it is just because of a sign error on the eigenvec...

2 years ago | 1

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Answered
Library function log10 not found when using fit
x = rand(10,1);y = x + rand(10,1); fit(x,y,'log10') It is almost always, ALWAYS the case that when this happens, you were prev...

2 years ago | 1

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Answered
iterative estimation of eigenvalues and eigenvectors by the inverse power method. Your MATLAB/Octave code shouldn’t be hardcoded. ● Calculate the eigenvectors and eigenvalues
Let me guess, you have a problem with this matrix. Does the matrix have any special properties? What, for example, are the eige...

2 years ago | 0

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using PCA to filter outliers in MATLAB
I've attached my quick shot at an n-dimensional outlier tool, based on Mahalanobis distance. I am pretty sure it has some seriou...

2 years ago | 1

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Answered
How do I plot a symbolic equation that I have created?
By the way, there is NOTHING symbolic in the code you wrote. syms t % this makes t symbolic % no need to put decimal points ...

2 years ago | 0

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scatter command not working
(It is good you are using the tutorials.) But first, learn to read the error message, an important skill in using MATLAB, unless...

2 years ago | 1

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Answered
Nonlinear optimization with branching solution space
Just solve 11 distinct problems, each of them continuous. Use a loop, setting x to each of the 11 possible values. Save each sol...

2 years ago | 1

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Answered
how to create nxn matrix with main diagonal that enters odd rows/columns with zero and even ones start with 2(n+1) sequence
Simple is to use diag. n = 5; % Now many non-zero elements will we have? N = 1:(2*n); % a simple index vector D = N.*mod(N-1,...

2 years ago | 0

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Does I properly translate the equations in matlab code?
Ouch. That would be a miserable set of equations to try to code. (You have my sympathies.) I did some very quick spot checks, an...

2 years ago | 0

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problem in curve fitting
C1 continuous? Is there a difference? Absolutely YES. C1 continuity, using circular "arcs" in 3-d? UGH. I'm a career mathemati...

2 years ago | 0

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species go to negative values
Remember that the software does not truly understand your model, and what you are attempting to simulate in that model. It only ...

2 years ago | 0

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Better "probabilities"?
How effective is rand? I'm not sure what you mean by "effective", or for that matter, "advanced". It is a state of the art rando...

2 years ago | 1

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Need help solving heat equation using adi method
You say it works for sufficiently small values dt. With that exp(t) term in there, do you seriously expect it to work well for...

2 years ago | 0

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Non-linear Algebraic 36 equations unsloved
Actually, a starting value set like ones(36,1) is often a dangerous thing to do. Making all of the starting values the same can ...

2 years ago | 0

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math model of neural network fitting
As is often the case with such "models", there is nothing you could write down, at least not easily, and without nasty arrays of...

2 years ago | 0

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About Fluid dynamics in a porous medium...
As @Torsten said, this is far too vague a question. I would suggest starting with a far simpler problem, especiially good is if...

2 years ago | 0

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