John D'Errico
Retired
Statistiques
62 Fichiers
Cody Discussions12 Points forts
RANG
9
of 300 765
RÉPUTATION
22 217
CONTRIBUTIONS
15 Questions
7 898 Réponses
ACCEPTATION DE VOS RÉPONSES
46.67%
VOTES REÇUS
4 849
RANG
4 of 21 084
RÉPUTATION
66 619
CLASSEMENT MOYEN
4.80
CONTRIBUTIONS
62 Fichiers
TÉLÉCHARGEMENTS
462
ALL TIME TÉLÉCHARGEMENTS
601534
CONTRIBUTIONS
0 Publications
CONTRIBUTIONS
0 Public Chaîne
CLASSEMENT MOYEN
CONTRIBUTIONS
12 Points forts
NOMBRE MOYEN DE LIKES
4
Feeds
How to download the certificate
I'm sorry, but no, we cannot resolve your problem. Answers is not customer support. Answers is a volunteer forum, generally comp...
12 jours il y a | 0
A soumis
HPF - a big decimal class
High precision floating point arithmetic, a new class written in MATLAB
18 jours il y a | 11 téléchargements |
Defining inequality constraint A*x <= b for genetic algorithm
As I said in my comment, you cannot set up a linear system of inequalities to constrain that curved path from self intersections...
21 jours il y a | 0
i want to add cplex and yalmip on my mac how ?
YALMIP is an external toolbox, written in MATLAB, so it could in theory be used by any MATLAB installation. However, it is proba...
22 jours il y a | 0
| A accepté
flag a question as answered.
While DGM gave a very complete answer, worthy of acceptance in my eyes, I think, from a look at one of the other questions from ...
25 jours il y a | 1
Finite elements model using STABIL
I cannot test your code, as I lack the tools you are using. Regardless, IF you tell us the solve yields NaNs, then there are onl...
environ un mois il y a | 0
Using logic to select specific values in a matrix
Well, you are doomed to failure, as long as you don't use the right variable names as you created them! A = [1, 0.1234 1,...
environ un mois il y a | 0
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...
environ 2 mois 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
environ 2 mois 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...
environ 2 mois 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...
2 mois 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 ...
2 mois 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...
2 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...
2 mois il y a | 0
| A accepté
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...
3 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...
3 mois il y a | 0
Discussion
OH NO! isprime is missing? (Just kidding)
What if you had no isprime utility to rely on in MATLAB? How would you identify a number as prime? An easy answer might be some...
3 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...
3 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 ...
3 mois il y a | 0
| A accepté
Discussion
Approximating a floating point number with a finite representation in decimal form
I saw an interesting problem on a reddit math forum today. The question was to find a number (x) as close as possible to r=3.6, ...
3 mois il y a | 0
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...
3 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...
3 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...
3 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...
3 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...
3 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...
3 mois il y a | 0
| A accepté
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, ...
3 mois il y a | 0
| A accepté
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...
4 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...
4 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...
4 mois il y a | 2
| A accepté
