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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
Transform coordinates into pixel
Use getframe and writeVideo like in this example: https://www.mathworks.com/help/matlab/ref/videowriter.writevideo.html#mw_6dab...

17 minuter ago | 0

Answered
Extracting tables within a cell.
Your files all seem to be identical (apart from some of the header data), so it is no surprise that every iteration seems to giv...

32 minuter ago | 0

Question


Why don't getframe RGB codes agree with plotted polyshape RGB codes?
In the code below, I have computed the RGB color code of the square as seen in both a polyshape plot (polyshapeRGB) and as seen ...

ungefär 7 timmar ago | 1 answer | 0

1

answer

Answered
Locate two neighboring nodes in space so as to divide the matrix into two
load xydata xy %Original 3D data mapped to 2D xy=xy(tspsearch(xy,5),:); %tspsearch is on the file exchange P=polyshape(xy,...

ungefär 9 timmar ago | 0

Answered
Loading multiple structure from a folder
It is because not all of the sub-structures mydata(n).data have the same fields. If you contest that, attach the mydata variable...

en dag ago | 0

| accepted

Answered
Can a ROI shape (ie. a Rectangle made by drawRectangle()) be a property of a class?
You need to specify the complete class name: classdef device properties tag string shape images.ro...

en dag ago | 0

Answered
How to create struct from fieldnames and values cell arrays for code generation ?
Does it support transpose for normal arrays? If so, then you might be able to do, list_fields = {'a'; 'b'; 'c'; 'd'}; % the fu...

en dag ago | 0

Answered
Four-parameters optimization of a 1D function: wrong values
I would recommend using fminspleas, https://www.mathworks.com/matlabcentral/fileexchange/10093-fminspleas with INLP=[p2,p3,p4...

en dag ago | 0

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...

2 dagar ago | 0

| accepted

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...

3 dagar 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...

4 dagar 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...

4 dagar ago | 1

| accepted

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...

4 dagar 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...

4 dagar 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; ...

4 dagar 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...

4 dagar 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...

5 dagar 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...

5 dagar ago | 1

| accepted

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 ...

5 dagar 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...

5 dagar 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...

5 dagar 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...

5 dagar ago | 0

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

6 dagar ago | 1

| accepted

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...

6 dagar 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...

6 dagar 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...

6 dagar 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...

6 dagar 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...

6 dagar 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)

6 dagar 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...

6 dagar ago | 1

| accepted

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