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using polyval with one of the polynomials of a spline obtained with the unmkpp command, the results do not overlap! Why?
@David Goodmanson and @dpb and @Steven Lord have all said the polynomial segments are intended to be LOCAL with respect to the b...

environ un mois il y a | 0

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Problems with code with symbolic variables.
No. I won't consult by gmail, or whatever. But there is no need. Even for k==2, what do I see? eqn = [3*c1^2 + 3*c3 == 0, 3*c...

environ un mois il y a | 0

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MATLAB Programming Techniques, Extracting Portions of a table
Why do you need it? Well, I don't see the question in the course, and I am not enrolled in the course, so... But what does that...

environ un mois il y a | 0

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I want show population on plot like 36M, 37M....
You want the plot to plot each point as a string like 36M, 38M, etc? Why not just divide by 1e6, then use the axis label to ind...

environ un mois il y a | 0

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Why are the components of the two eigenvectors not continuous and smooth, when the underlying data is continuous and smooth?
You can think of the eigenvalues (and assiciated eigenvectors) as coming from the roots of a polynomial. In fact, they do exactl...

environ un mois il y a | 2

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How to interpolate values given a starting and end point
If you ONLY have two data points, the only possible interpolation is LINEAR. There is no fancy method to interpolate in a nonlin...

environ un mois il y a | 0

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Syntax for specifying boundary condition using dsolve.
Your beam is fixed in position at the left end, as is the slope at that point. At the right end, you have fixed the location, b...

environ un mois il y a | 1

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How to use fminsearch for vectors
I think your problem is you are confused. And your confusion turns into a highly confusing question. Questions like is the optim...

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How to Reduce Oscillations (not noise) in a Signal?
To me, the upper signal looks like the convolution of something like a sinc with the lower signal. And that would mean, IF you k...

environ un mois il y a | 0

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How to find the intersection of linear regression model and yline
Pretty boring data. T(:,1) = [0 1 2 3 4 5]; T(:,2) = [0 1 2 3 4 5]; P = polyfit(T(:,1),T(:,2),1) a = P(1) b = P(2) They...

environ un mois il y a | 0

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Issue with solving ill-conditioned symbolic DAE system
You have a DAE, with a linear constraint system that happens to be ill-conditioned. I would try reducing the constraint system. ...

environ 2 mois il y a | 0

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inv(A)*B*inv(A) or A\B/A, which is more accurate for a full rank A and half rank B
Why would you want to compute the inverse of A TWICE ANYWAY? Even using both slash and backslash is arguably a bad idea, since a...

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Finding accurate inverse of binary circulant matrix
Gosh. I thought that multiplying a matrix by its inverse gives an identity matrix. :) A = readmatrix('MixingLayer.xlsx','sheet'...

environ 2 mois il y a | 0

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Doing a Matlab update without charging
Is it a bad thing? Only in the sense that if your computer suddenly dies in the middle, the software may now be in a spot where ...

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Not able to plot a proper graph for the equation.
syms x y = (1*1*((25)-(x.^2)))/((x.^4)-((x.^2)*((1*(1.78))+(25)+1))+(1*(25))) First, where are the poles? A pole lives where t...

environ 2 mois il y a | 0

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How to find solution to system of 2 circle equations in Matlab?
Torsten has answered your question perfectly well, I think. No solution exists for that problem as posed. But suppose you had a ...

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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...

environ 2 mois il y a | 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...

environ 2 mois il y a | 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...

environ 2 mois il y a | 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...

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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...

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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 + ...

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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...

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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...

environ 2 mois il y a | 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 ...

environ 2 mois il y a | 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...

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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(...

environ 2 mois il y a | 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...

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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...

2 mois il y a | 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...

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