John D'Errico
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Feeds
In how many functions using the global variable, can a global variable be declared?
There is no limit on how many functions can use a global variable. At the same time, I will plead, for your own sanity, to recon...
14 jours il y a | 1
How do I plot a graph with the grid for trig functions with 0 ≤ x ≤ 2π
@Sean syms x f = cos(x) dfdx = diff(f) help fplot
15 jours il y a | 0
| A accepté
Should I need keep in my PC previous versions of Matlab?
Some of us keep older releases, just to answer a question about an older release, testing out code in the old release. I do ten...
15 jours il y a | 0
Unable to fetch more decimal points for values stored in sldd
You need to learn about the format command. All of the digits are still there, they were just not reported. I'll add a few digit...
25 jours il y a | 1
The symbol "1" is not a scalar in integral3
If ALL you want to do is compute a volume, especially of such a simple domain, there are better ways to do so. If the domain is ...
29 jours il y a | 1
How does the svd function determine or fix the phase of singular vectors?
First, signs are to some extent arbitrary. That is, for EIG, you can multiply an eigenvector by -1, and it is still an eigenvect...
environ un mois il y a | 1
Obtaining the differential equations from graphical representation of the problem
Can you show that a set of equations is a valid representation of some data, merely by comparing them to a curve you find in som...
environ un mois il y a | 0
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Will the old-style class definitions be supported in future version of Matlab?
One thing you cannot realistically ask on Answers (if you expect a fully valid answer) is what decisions about MATLAB will be ma...
environ un mois il y a | 1
Modelling a system of differential equations with recurrences in matlab
This is known as a delay differential equation. You will find any solvers for them starting with the letters dde. help dde23 Y...
environ un mois il y a | 0
Iterating the eigenvalue function (eig) produces patterns --- is this a well known result?
I'd have a hard time believing this is well known. @Christine Tobler would be the one to know though, and she agrees. It just f...
environ un mois il y a | 0
Question on the format of 2D curve fit equations in plot
Scientific notation. 6.588e + 06x^2 == 6.588*10^6 * x^2 Note that it is easier and faster to write, and even a bit easier to ...
environ 2 mois il y a | 0
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How do I find the average of a vector of units by using a for loop?
When you create a variable name, NEVER, NEVER, NEVER use a name that is an existing and useful function name. (Well, it might be...
environ 2 mois il y a | 0
how to find orthonormal vector with condition?
Confusing question. Which probably means I'm misunderstanding your goal here, or that I am myself confused, which is not uncommo...
environ 2 mois il y a | 0
Closed contour with least square differences to dataset
This can be quite difficult if you have some completely arbitrary form. But you tell us this is a simple closed form. And as lon...
environ 2 mois il y a | 0
MATLAB R2018a needed
We cannot give you a copy of MATLAB. Answers is not customer support anyway. And even they don't just give out copies for anyone...
2 mois il y a | 0
[coeffA,scoreA,latentA] = pca(X);
The editor likes to complain. Just the kind of program it is. Think about this as a suggestion, a hint, in case maybe your code...
2 mois il y a | 0
How to define 1-bit variable in data dictionary?
MATLAB does not have a true 1-bit data class. Even a logical, which is clearly a 1 bit thing, thus either true or false, is sto...
2 mois il y a | 0
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Polyfit isn't adjusting to decreasing sinoidal data
Do you appreciate just how NON-polynomial-like this data is? Your data appears to be a variation of decaying sinusoid. While, ...
2 mois il y a | 0
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Precision Loss in Arithmetic Encoding of Binary Vectors for Reversible Data Hiding in 3D Meshes
You are telling us that you effectively have a binary number with 7000 binary bits. You convert it to a decimal number, and then...
2 mois il y a | 0
| A accepté
SVD to a matrix subset (rows)
No, I don't think you can easily find the SVD of a subset of the rows of a matrix, based on the SVD of the full matrix. At least...
2 mois il y a | 2
I can not say wether Eigs is giving expected results or not
It is literally trivial to get large differences there. We need not even use eigs. Eig will suffice. A0 = randn(6); A0 = A0 + A...
2 mois il y a | 2
| A accepté
How to correctly find the solution of a system of equations containing trigonometric functions
It was smart of you to look at the results, and question them. Always think about what comes out from a solver. Does the solutio...
3 mois il y a | 0
Analytic solution of quatric polynomial does not add up
One of the things you need to learn about symbolic algebra, is two expressions may not look the same, but that does not mean the...
3 mois il y a | 0
Function requires a Toolbox for which you do not have a license
If you could use it in the past, then you had a license for that toolbox. You cannot use a function from a toolbox where you lac...
3 mois il y a | 0
save a cmyk image in jpeg
No. Imwrite cannot save a CMYK image to JPG. However, it can save a 4 channel image to a PNG format. Then I would open the image...
3 mois il y a | 0
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Help with Difference Equation in MATLAB
Since V_i and h_i appear to vary with the index i, there is no analytical solution. (If V and h were constants, not changing wit...
3 mois il y a | 0
Unexpected results using SVD to separate components that make up a function
Yes. You do misunderstand how svd works, and what it produces. As well, I think you misunderstand what a rank 1 matrix means. A...
3 mois il y a | 1
| A accepté
Why does DC offset occur when integrating AC signals in MATLAB/Simulink?
It looks like you want to integrate what appears to be a sine wave. You did that, expecting to get a pure cosine wave, Right? ...
3 mois il y a | 2
fill function sometimes working and sometimes not working, why?
Seems trivial to me. (Ok, easy. Triviality is in the eye of the beholder.) I don't give a hoot about how many real roots it has,...
3 mois il y a | 0
how to manage fzero output
I'd argue you are thinking about this the wrong way.You see that fzero has a problem, so you think you need to do something to f...
3 mois il y a | 0
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