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How to colour a portion of a curve by red and remaining by black
Plot it as TWO curves, both on the same figure, one in red, one in black. Use the hold command between the two calls to plot, s...

6ヶ月前 | 0

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Solve an ODE on a torus
Simple enough. Just transform the problem. So if [u,v] live on [0,1]x[0,1], then s = (cos(2*pi*u)+1)/2 t = (cos(2*pi*v...

6ヶ月前 | 0

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Problem with matrix dimensions
I'm not sure why you would use a Newton method to solve what solve will do directly, in an apparent algebraic form. beta1 = 0.0...

6ヶ月前 | 0

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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...

6ヶ月前 | 0

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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...

6ヶ月前 | 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 + ...

6ヶ月前 | 0

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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...

6ヶ月前 | 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...

6ヶ月前 | 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 ...

6ヶ月前 | 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...

6ヶ月前 | 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(...

6ヶ月前 | 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...

6ヶ月前 | 0

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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...

6ヶ月前 | 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...

6ヶ月前 | 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...

6ヶ月前 | 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...

6ヶ月前 | 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 ...

6ヶ月前 | 0

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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...

6ヶ月前 | 1

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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...

6ヶ月前 | 1

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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...

6ヶ月前 | 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...

6ヶ月前 | 1

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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 ...

6ヶ月前 | 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...

6ヶ月前 | 1

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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...

6ヶ月前 | 1

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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,...

6ヶ月前 | 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...

6ヶ月前 | 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...

6ヶ月前 | 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 ...

6ヶ月前 | 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...

6ヶ月前 | 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...

6ヶ月前 | 0