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.

Statistics

All

View badges

Content Feed

Answered
While loop has disagreeing matrix dimensions
while strcmpi(inputMaterial,'steel')

9 hours ago | 0

| accepted

Answered
HOW CAN I DEAL WITH NEGATIVE VALUS I AM RECEIVING AFTER PERFORMING DECOMPOSITION
Threshold them? x=[-2 -1 0 1 2 3] xpos=max(x,0)

4 days ago | 0

Answered
Attempt to execute SCRIPT varargin as a function:
Your function does not begin with the function declaration line.

4 days ago | 0

Answered
Extract fields from structure
S.C.XX_YY1=5; S.C.XX_YY2=10; S.C.ZZ=3; f=fieldnames(S.C); I=startsWith(f,'XX_YY'); f=string(f(I)); for fI=string(f...

4 days ago | 0

Answered
Create the program to return the orthogonal basis and orthonormal basis
You should just use orth to get the orthonormal basis. And you should use qr instead of Gram-Schmidt.

5 days ago | 1

Answered
Running multiple scripts on separate cores in parallel
fcn=@(i) run("test"+i); for K=1:n F(K)=parfeval(fcn,0,K); end; wait(F)

7 days ago | 0

| accepted

Answered
A compact way to remove empty rows in a cell array matrix ?
a = { '22-Jul-2021 17:00:00', 49 '', [] '', [] '', [] '', [] '27-Jul-2021 20:00:00', 123 '...

7 days ago | 0

| accepted

Answered
How define limits of upper and lower bound in Fmincon having different variables
SInce X0 is 4x3, your LB and UB will be 4x3 as well.

7 days ago | 0

| accepted

Answered
Specify initial condition for linprog?
You can try adding the inequality constraint f.'*x<=f.'*x0.

7 days ago | 0

Answered
Vectorize an anonymous function
This FEX submission already appears to do what you want, https://www.mathworks.com/matlabcentral/fileexchange/69116-gaussfitn?s...

7 days ago | 0

Answered
Vectorize an anonymous function
Just replace all the uniqPosOne(n,:) with uniqPosOne: gaussElpt = @(param) (param(1) + param(2).*(exp(-1/2 .* (uniqPosOne - [p...

7 days ago | 0

| accepted

Answered
Fast fourier transform on every single pixel of time series images
fftn(ImageSeries,[],3)

7 days ago | 0

Answered
Error in using 'cumtrapz' for integration
But next, value of h1 at each grid point must match {-sin(grid point value) - (-sin(-1))}, No, it will be -sin(x)+x*cos(-1) -(...

7 days ago | 0

| accepted

Answered
sorting an array in a specific order
x=[1 2 2.5 3 4 5]; y= 3.4; [~,is]=sort(abs(x-y)) x=x(is)

7 days ago | 0

| accepted

Answered
Genetic Algorithm for points External To a Specific Volume
You would have to use a non-linear constraint function for that: function [cineq,ceq]=nonlcon(x) x=reshape(x,3,[]); %reshap...

7 days ago | 0

| accepted

Answered
How can I assign zeros to a particular value in an expression
N =8; u = [0,(1:N-1),0]; v=N:N-1+numel(u); rhsode=diff(u,2)+v(3:end)-v(1:end-2)

7 days ago | 0

Answered
Question about the fminsearch Algorithm
Is there a way for me to actually set up the starting simplex by myself? So that instead of giving the fminsearch-solver an init...

7 days ago | 0

Answered
Fitting a line of best fit on a plot only between a restricted domain.
You can do it interactively with the brush tool and basic fitting menu options on the figure toolbar. https://www.mathworks.com...

8 days ago | 0

Answered
Query regarding toolbar in MATLAB App designer
As far as I can tell, you must rebuild the toolbar using uitoolbar, uipushtool, and uitoggletool.

8 days ago | 0

Answered
Parallel processing in ga using 'UseParallel'
Is it that it calls the objective function in parallel? Yes. And can I specify in the parallel pool settings that only 10 are...

8 days ago | 1

Answered
Automatisation of struct creation and data import
for i=1:3 data_alone_paired(i,1).acc_pelvis_subject1 = data_alone(2*i-1).fsignal_down(:,1); data_alone_paired(i,1).acc_pelvi...

8 days ago | 0

| accepted

Answered
How to calculate the rotation of this egg?
BW1=~getEgg('egg1.png'); BW2=~getEgg('egg2.png'); S1=regionprops(BW1,'Orientation'); S2=regionprops(BW2,'Orientation'); ...

8 days ago | 1

Answered
How to calculate the rotation of this egg?
First, crop the black corders from your image fiels. Then, use ellipticalFit() from, https://www.mathworks.com/matlabcentral/fi...

8 days ago | 1

Answered
How can I calculate and plot a 3D pointing vector from a 2D azimuth and elevation angle?
x1=2; %initial x position y1=2; %initial y position z1=0; elev=20; [az,r]=cart2pol(x1,y1); [x2,y2,z2]=sph2cart(az,elev*...

8 days ago | 0

| accepted

Answered
Not enough input arguments
It must be something in your environment. Running the code here in the forum produces no errors. I would suggest clearing the wo...

8 days ago | 0

Answered
Deduplicate Rows from Struct
How about this? Database.x = [1 0 1 2 0 2 3 0 1 1 0 1]; Database.f = [10 20 ...

9 days ago | 0

| accepted

Question

Is there a way to specify objective and constraint gradients when doing nonlinear optimization in the problem-based framework?
In the solver-based framework, user-applied gradients are specified as additional output arguments from the objective and constr...

9 days ago | 1 answer | 0

1

answer

Answered
fmincon nonlinear inequality constraint
The nonlinear constraints are not obeyed at all iterations. At iterations where they are not obeyed, chol() will give you an err...

9 days ago | 2

| accepted

Answered
Remove centroid locations of objects that are too close
A=[xf(:) yf(:)]; D=pdist2(A,A); D(D==0)=inf; %retroactive EDIT keep = all(D>d,1); xf=xf(keep); yf=yf(keep);

9 days ago | 0

| accepted

Answered
Number of .mat files into single .mat file
It depends what they contain and how you want the variables joined within the final .mat file. One way: filenames="data"+(1:10...

9 days ago | 1

| accepted

Matt J

Statistics

MATLAB Answers

File Exchange

File Exchange

File Exchange

File Exchange

File Exchange

MATLAB Answers

MATLAB Answers

MATLAB Answers

MATLAB Answers

MATLAB Answers

MATLAB Answers

Content Feed

1