John D'Errico
Retired
Statistica
All
MATLAB Answers
File Exchange
62 File
Cody HighlightsRANK
9
of 300.331
REPUTAZIONE
22.193
CONTRIBUTI
15 Domande
7.889 Risposte
ACCETTAZIONE DELLE RISPOSTE
46.67%
VOTI RICEVUTI
4.844
RANK
4 of 20.920
REPUTAZIONE
66.501
VALUTAZIONE MEDIA
4.80
CONTRIBUTI
62 File
DOWNLOAD
623
ALL TIME DOWNLOAD
600468
CONTRIBUTI
0 Post
CONTRIBUTI
0 Pubblico Canali
VALUTAZIONE MEDIA
CONTRIBUTI
1 Punto principale
NUMERO MEDIO DI LIKE
8
Feeds
Risposto
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...
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...
1 giorno fa | 1
Risposto
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 ...
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 ...
4 giorni fa | 1
Risposto
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...
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...
7 giorni fa | 1
Risposto
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...
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...
8 giorni fa | 0
| accettato
Risposto
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...
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...
10 giorni fa | 1
Risposto
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...
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...
12 giorni fa | 0
Risposto
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...
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...
16 giorni fa | 0
Risposto
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 ...
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 ...
24 giorni fa | 0
| accettato
Risposto
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...
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...
26 giorni fa | 0
Risposto
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...
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...
circa un mese fa | 0
Risposto
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...
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...
circa un mese fa | 0
Risposto
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...
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...
circa un mese fa | 0
Risposto
[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...
[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...
circa un mese fa | 0
Risposto
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...
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...
circa un mese fa | 0
| accettato
Risposto
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, ...
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, ...
circa un mese fa | 0
| accettato
Risposto
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...
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...
circa un mese fa | 0
| accettato
Risposto
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...
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...
circa 2 mesi fa | 2
Risposto
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...
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...
circa 2 mesi fa | 2
| accettato
Risposto
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...
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...
circa 2 mesi fa | 0
Risposto
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...
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...
circa 2 mesi fa | 0
Risposto
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...
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...
circa 2 mesi fa | 0
Risposto
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...
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...
2 mesi fa | 0
| accettato
Risposto
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...
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...
2 mesi fa | 0
Risposto
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...
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...
2 mesi fa | 1
| accettato
Risposto
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? ...
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? ...
2 mesi fa | 2
Risposto
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,...
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 mesi fa | 0
Risposto
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...
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 mesi fa | 0
| accettato
Risposto
Inquiry on Time Complexity of cumsum
There is no (good) answer to your question. And that answer will subtly change next year too, with the next release of MATLAB, o...
Inquiry on Time Complexity of cumsum
There is no (good) answer to your question. And that answer will subtly change next year too, with the next release of MATLAB, o...
3 mesi fa | 2
| accettato
Risposto
Effect of rng on Genetic Algorithm
Let me expad on what @Walter Roberson said. There is no optimum seed, that is one seed that will be perfect for any problem. In ...
Effect of rng on Genetic Algorithm
Let me expad on what @Walter Roberson said. There is no optimum seed, that is one seed that will be perfect for any problem. In ...
3 mesi fa | 0
Risposto
where is the setting to page/summarize large tables?
We don't want you to go nuts. But, I'm a little surprised, as tables do what you want already by default, using R2025a, on my co...
where is the setting to page/summarize large tables?
We don't want you to go nuts. But, I'm a little surprised, as tables do what you want already by default, using R2025a, on my co...
3 mesi fa | 0
