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Matt J


Last seen: Today Active since 2009

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
Solve for A matrix in Ax = 0
n=numel(x); mask=tril(triu(ones(n),-1),+1); %tridiagonal mask A=optimvar('A',[n,n]); prob = eqnproblem; prob.Equation...

ongeveer 4 uur ago | 0

Answered
negative value structural similarity index
A negative SSIM value means the values in those regions tend to be negatively correlated. When X goes low, then Y tends to go hi...

1 dag ago | 0

Answered
How to handle imagedatastore when input and response have different dimension?
Modify the trntf_input, trntf_label datastores' ReadFcn so that when it reads in the image, it wraps it in a 1x1 cell array. S...

1 dag ago | 0

| accepted

Answered
How to plot 3D plane of surface with 3 coordinates data?
You can use planarFit, from this FEX download, https://www.mathworks.com/matlabcentral/fileexchange/87584-object-oriented-tools...

1 dag ago | 1

Answered
Cure fitting - lsqnonlin
I initially inputted my guess, lower bound, and upper bound with the true optimized values obtained from a published paper. Surp...

1 dag ago | 1

Answered
What would be the equation of the following surface?
You could try fitting a 2D Gaussian surface to it, e.g., with this FEX download, https://www.mathworks.com/matlabcentral/fileex...

1 dag ago | 0

Answered
Finding Transformation Matrix of a viewer3d object
I think the 3x4 camera projection matrix P would be, h=gca(); camz=h.CameraTarget-h.CameraPosition; camy=-h.CameraUpVector; ...

2 dagen ago | 1

| accepted

Answered
Uploading .mat files that contain nested structs into a datastore
This example shows how to use a fileDataStore to read partial data from a .mat file https://www.mathworks.com/help/matlab/ref/m...

2 dagen ago | 0

Answered
Which optimization tool should be used for solving my convex optimization problem?
If, as you seem to, you have a non-quadratic (and therefore also nonlinear) convex objective function, then you must use fmincon...

2 dagen ago | 0

Answered
Fixed-distance of legend outside plot axes
is there any "simple" parameter (i.e., not position) which controls the vertical distance between the legend box and the upper e...

2 dagen ago | 1

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Answered
the arc using the chord
Assume the chord is of length L and, with no loss of generality, assume also that it is aligned with the x-axis with end points ...

2 dagen ago | 1

Answered
Dot Multiplication in MATLAB
For matrices A and B, the rule is generally that A.* B is element-by-element multiplication a(i,j).*b(i,j), which means that nor...

3 dagen ago | 1

| accepted

Answered
Find paths in graph that satisfy specific condition
s=[17,17,17,18,18,19,19,20,20,21,21,22,22,23,23,24,24,25,25,26,26,27,27,28,28,29,29,30,30]; t=[18,19,20,21,22,23,24,25,26,27,28...

3 dagen ago | 0

| accepted

Answered
Getting error in fmincon with below code how to correct it
You seem to be trying to minimize over a space of functionals, F. You cannot do that with fmincon. The objective must be a funct...

3 dagen ago | 0

Answered
How to plot a grouped bar chart?
https://www.mathworks.com/help/matlab/ref/bar.html#bthxce9

3 dagen ago | 0

Answered
Subdivide a figure with a grid (as in Timescope)
Something like this, perhaps? t=tiledlayout(2,2); for i=1:4, nexttile(t), plot(rand(1,4)); grid on; end background=axes('Po...

3 dagen ago | 0

Answered
vectorized operations on symbolic functions
syms x1 x2 x3; % symbolic variables y = x1^3/3 + x2^2/2 - x3; % symbolic function y X = rand(500,3); % each row representing a...

3 dagen ago | 1

Answered
How to add an image to the current axes without replacing existing plots
You can use hold fcontour(@(x,y) (x-50).^2+(y-50).^2,[20,80],'m'); hold on imshow(imread('cameraman.tif')); hold off h=gc...

4 dagen ago | 0

Answered
Restart Fmincon Optimization from Checkpoint File
No, unfortunately. Restarting from the last point is probably the best you can do. Although, apart from the interior-point algor...

4 dagen ago | 0

| accepted

Answered
Image semantic segmentation dimension layer why not match input and output
Below is what analyzeNetwork gives. Only you know what you want the dimensions of each of your activation maps to be. Tell us at...

4 dagen ago | 0

Answered
Combining two arrays using a seconds order
number = randperm(10, 10) number2 = randperm(10, 10) I=ismember(number2,number(1:5)); number(1:5)=number2(I)

4 dagen ago | 0

| accepted

Answered
How can I calculate the unique centroids along with its radius range ?
load data; threshold=2; %Example input T=sortrows(table(Centroid, Radius),2) Centroid=T.Centroid; Radius=T.Radius; D=pdi...

4 dagen ago | 1

| accepted

Answered
Profile and debug load function
You could pursue your hypothesis by extracting the table from an object, then saving the idnlarx column to its own .mat file. Th...

4 dagen ago | 0

Answered
Struct field name with space or special character
Another option is to use dictionaries, which are a bit more similar to structs than tables, e.g. secretID=["Steve Rogers", "Ton...

5 dagen ago | 1

Answered
How do I mark all critical points on a graph of a function?
syms x; f=(sin(x)+(1/3)*(cos(5*x))); v=matlabFunction( diff(f) ); f=matlabFunction(f); x=linspace(0,2*pi,1e5); loc=find(g...

5 dagen ago | 1

| accepted

Answered
How do I add transparency to a plot in the Live Editor?
The syntax of giving an RGBA color setting seems to be a very old and undocumented feature, https://undocumentedmatlab.com/arti...

5 dagen ago | 1

Question


Plotting lines with quadruplets R-G-B-Alpha ?
It appears that in recent Matlab, I am able to append a 4th number to the RGB triplet, which appears to set either a transparenc...

5 dagen ago | 2 answers | 0

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answers

Answered
identifying and isolating consecutive numbers
code that will split A into B = [1 2 3 4] C = [14 15] D = [23 24 25] It would be a bad idea to split A into separate variables,...

6 dagen ago | 1

| accepted

Answered
Modifying the objective function in order to meet the optimization variable boundaries
If the boundaries are given by simple lower and upper bound vectors lb and ub, you can do, function fun=objective(A,lb,ub) ...

6 dagen ago | 0

Question


Where is dlfeval tracing information stored?
When dlfeval() is used to call a function, the computation is traced in such a way as to later allow automatic differentiation v...

6 dagen ago | 1 answer | 0

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