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Matt J


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Professional Interests: medical image processing, optimization algorithms PLEASE NOTE: I do not read email sent through my author page. Please post questions about FEX submissions in their respective Comments section.

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Réponse apportée
not enough input arguments using variables from another equation system
z = fsolve(@(z)TAC2(x,z) ,z2)

environ 13 heures il y a | 0

Réponse apportée
Why does fft of non-integer number of cycles sin wave NOT have sidelobes?
We don't know what you're doing since we haven't been shown your code. However, here is an example to show that you won't get pe...

1 jour il y a | 1

Réponse apportée
Find Gaps and Overlaps in Rectangular Prisms
If you can get R2025a with the PDE Toolbox, you gain access to tools that are very well-suited to this problem. In particular wi...

1 jour il y a | 0

Réponse apportée
How do I set the size of a tile from tiledlayout?
You can't set the plot size in absolute terms with tiledlayout. You would have to layout the axes positions explicitly, e.g., %...

1 jour il y a | 0

Réponse apportée
Find Gaps and Overlaps in Rectangular Prisms
Does a "gap" not occur whenever the two prisms being compared neither touch, nor overlap? If so, why not as below? % Fit the fo...

1 jour il y a | 0

Réponse apportée
Fitting exponential using derivatives
however, i do not have the y values If y=dr_dt, then you can approximate y numerically, y=gradient(r,t) However, it be advisa...

1 jour il y a | 0

Réponse apportée
Solving an implicit equation with fzero in a function.
fun = @(h) weir_height2(h,weir_height,total_weir_length,total_weir_discharge)

2 jours il y a | 0

| A accepté

Réponse apportée
Is vectorization worth the trouble with recent MATLAB?
Yes, it will always be worthwhile for a certain space of computations, because a plain for-loop will always be done sequentiall...

2 jours il y a | 0

| A accepté

Réponse apportée
appdesigner - disruptive help popups
Go to Home > Preferences > Editor/Debugger > Auto-completion.

3 jours il y a | 0

Réponse apportée
Picking only 2 nested for loops among several.
Get rid of all the nested loops. Use the combinations command to create a table of all combinations of your variables. Then, yo...

3 jours il y a | 3

Réponse apportée
Error in appdesigner number of arguments
There's nothing wrong with the code. I suspect you have defined your own version of uibutton() somewhere shadowing the builtin f...

3 jours il y a | 0

| A accepté

Réponse apportée
find sequence in a matrix
I=[0 1 0 1 1 1 0 0 0 1 1 1 0 0 1 0 1 0; 0 1 0 1 0 1 0 1 0 1 0 1 0 0 1 0 0 1; 1 1 0 1 0 1 0 0 0 1 0 1 0 0 1 1 1 0] k=3...

3 jours il y a | 0

Réponse apportée
Error using the fmincon function
No, the constraint and objective functions have to return real values to be considered "defined". Possibly you have log() or sq...

4 jours il y a | 0

| A accepté

Réponse apportée
Aquiring images from mobile camera is too slow
Yes, you can postpone the image display until after the acquisition. N=1000; [img,t]=deal(cell(1,N)); for i=1:N [img{i},...

4 jours il y a | 0

Réponse apportée
Plotting, how can I stop fill hiding the tickmarks?
X = 0:20; Y = sin(X/10); plot(X, Y, 'ko'); hold on; % Draw white patch (e.g., to "highlight" a region) Xfill = [10 20 20...

4 jours il y a | 0

| A accepté

Réponse apportée
Spatial filtering of cylindrical data
Using padarray you can pad circularly in theta and symmetrically in z and then filter with 'valid' shape flags. If you are filte...

4 jours il y a | 0

Réponse apportée
find sequence in a matrix
I=[0 1 0 1 1 1 0 0 0 1 1 1 0 0 1 0 1 0;0 1 0 1 0 1 0 1 0 1 0 1 0 0 1 0 0 1;1 1 0 1 0 1 0 0 0 1 0 1 0 0 1 1 1 0]; k=3; Ik=str...

4 jours il y a | 0

Question


Launch a desktop layout programmatically
In the Environment seciton of the desktop's Home Tab, there is an area for saving and loading one's preferred desktop layouts: ...

4 jours il y a | 1 réponse | 0

1

réponse

Réponse apportée
Quick Access bar capacity
One option that had occurred to me was to create a figure, as below) filled with uicontrol buttons which could serve the same pu...

4 jours il y a | 0

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find sequence in a matrix
I=[0 1 0 1 1 1 0 0 0 1 1 1 0 0 1 0 1 0;0 1 0 1 0 1 0 1 0 1 0 1 0 0 1 0 0 1;1 1 0 1 0 1 0 0 0 1 0 1 0 0 1 1 1 0] k=3; [minv...

5 jours il y a | 0

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Customized text modification buttons for the Matlab Editor
A pair of functions enabling simple, programmatic modification of Matlab Editor text. These can be used to make customized butto...

6 jours il y a | 13 téléchargements |

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Réponse apportée
how to determine the wavelengths of an fft of a non-dimensional sequence
Perhaps as follows? %Example N=100; t=linspace(0,2*pi,N+1); t(end)=[]; x1=sin(t) ; %Wavelength N=100 x2=sin(2*t) ; %Wavelen...

6 jours il y a | 1

Question


Quick Access bar capacity
My Quick Access bar is filling up: What happens when I want to add more buttons than will fit on the top blue strip, even...

6 jours il y a | 2 réponses | 0

2

réponses

Réponse apportée
Index exceeds the number of array elements
Either testarray is shorter than you planned or sentsize(1) is larger than you planned. Specifically sentsize(1)+35 is exceedin...

9 jours il y a | 0

Réponse apportée
Obtain Pixel Shift from Registered Images
There's no reason you can't use the tform from imregtform to imwarp the original images, even if the registration was done on cr...

9 jours il y a | 0

Réponse apportée
Trouble using container with cell type for key and structure array for values..
Perhaps use a dictionary, instead of containers.Map? keys = compose("A0%.2d" , 1:15); values = struct('abc', num2cell(1:15));...

9 jours il y a | 1

Réponse apportée
How to prevent parfor from slowing down towards later iterations?
Is there a way to change this? I suspect not. Firstly, if you have reduction variables, the workers that aren't iterating aren'...

10 jours il y a | 0

Réponse apportée
How can I reduce the "method error" with my central-difference method, when estimating a Jacobian matrix of partial derivatives?
Try making the step size adaptive to the evaluation points. E.g. f=@(x) x.^3; %function g=@(x) 3*x.^2;%true derivative G=@(x...

11 jours il y a | 0

| A accepté

Réponse apportée
How can I draw a circular trend line in a heat map?
If the trend line is supposed to be elliptical, you can use gaussfitn, https://www.mathworks.com/matlabcentral/fileexchange/691...

11 jours il y a | 1

| A accepté

Réponse apportée
How do I add semi-colons to lines of MATLAB code automatically in MATLAB?
You can use favoriteForceSemicolons.m from this File Exchange download, https://www.mathworks.com/matlabcentral/fileexchange/18...

13 jours il y a | 0

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