Matt J

Last seen: Today | Active since 2010

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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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Answered
Constraints to a Second Order Curve Fit
It probably makes more sense just to do a linear fit. For this data, at least, a 2nd order fit doesn't make too much sense. Rega...

ongeveer 7 uur ago | 0

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

ongeveer 21 uur ago | 0

Answered
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 dag ago | 1

Answered
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 dag ago | 0

Answered
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 dag ago | 0

Answered
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 dag ago | 0

Answered
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...

2 dagen ago | 0

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

2 dagen ago | 0

| accepted

Answered
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 dagen ago | 0

| accepted

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

3 dagen ago | 0

Answered
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 dagen ago | 3

Answered
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 dagen ago | 0

| accepted

Answered
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 dagen ago | 0

Answered
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 dagen ago | 0

| accepted

Answered
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 dagen ago | 0

Answered
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 dagen ago | 0

| accepted

Answered
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 dagen ago | 0

Answered
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 dagen ago | 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: ...

5 dagen ago | 1 answer | 0

1

answer

Answered
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...

5 dagen ago | 0

Answered
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 dagen ago | 0

Submitted

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 dagen ago | 13 downloads |

0.0 / 5

Answered
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 dagen ago | 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 dagen ago | 2 answers | 0

2

answers

Answered
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 dagen ago | 0

Answered
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 dagen ago | 0

Answered
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 dagen ago | 1

Answered
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 dagen ago | 0

Answered
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 dagen ago | 0

| accepted

Answered
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 dagen ago | 1

| accepted