Matt J

Last seen: Today | Active since 2009

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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
Separating intersecting blobs on an image
This uses some tools downloadable from, https://www.mathworks.com/matlabcentral/fileexchange/90762-further-tools-for-analyzing-...

ungefär 14 timmar ago | 1

| accepted

Answered
Unrecognized function or variable 'transformerLayer'
I don't see transformerLayer in the documentation anywhere, so I imagine it does not exist, and that you are probabaly running a...

en dag ago | 0

Submitted

Find vertices in image of convex polygon
Estimates the corner points of a pixelated convex polygon having a known number of vertices.

5 dagar ago | 4 downloads |

5.0 / 5

Answered
Modifying loss function in neural network to be dependent on previous losses
It would require a custom training loop, https://www.mathworks.com/help/deeplearning/ug/train-network-using-custom-training-loo...

5 dagar ago | 1

Answered
Exporting Best Fitness Variables from Surrogate Algorithm
The OutputFcn option gives you access to incumbentX, https://www.mathworks.com/help/gads/surrogate-optimization-options.html#mw...

5 dagar ago | 0

| accepted

Answered
Use more chessboards to get one cameraParameter? (cameraCalibration, estimateCameraParameters)
Each slice of imagePointsAll should contain points from one and only one perspective of the chequerboard. Different slices shoul...

5 dagar ago | 0

Answered
How do I find the corner points of an mask
You could download pgonCorners, https://www.mathworks.com/matlabcentral/fileexchange/74181-find-vertices-in-image-of-convex-pol...

5 dagar ago | 0

Answered
plot ellipse with given degree range
t = linspace(0,45,100); theta=0; %degrees a=2; b=1; x0 = 0; y0 = 0; N=1000; p=translate( scale(nsidedpoly(N),[a,b]) , x0,...

8 dagar ago | 1

Answered
plot ellipse with given degree range
Using this FEX package, https://www.mathworks.com/matlabcentral/fileexchange/87584-object-oriented-tools-to-fit-plot-conics-and...

8 dagar ago | 0

Answered
Find blocks iof non-zero values in Matrix
Yes, the locations of the blocks are given by, f=@(z,k,dim) movmin(z,k,dim,Endpoints='fill'); locations = f( f( m ,6,2) ,20,...

8 dagar ago | 0

Answered
Iteratively remove the rows and columns of a matrix
Hnz=nonzeros(H); C=Hnz*Hnz';

9 dagar ago | 1

Answered
importONNXFunction can't import 'Conv' Operator which is not supported with its current settings or in this context?
This 'Conv' operator should be supported, as it has been specified in the documentation as a supported operator. I haven't loo...

9 dagar ago | 0

Answered
Ho to Constraint GA to Generate Population Within Design Space
Yes, you can reparametrize the design vector x as, x=t1*v1+t2*v2 where v1 and v2 are the direction vectors of the two rays bou...

12 dagar ago | 0

| accepted

Answered
Is it possible to allow a range for |Aeq*x-beq|<10e-6 in intlinprog function?
is it possible to specify a tolerance for the equality constraints such that the solution satisfies ∣Aeq⋅x−beq∣ <10−6 rather th...

13 dagar ago | 0

Answered
Find X intercept with error estimates
If I can find the errors on the coefficients p, then I can easily find the uncertainity in the x intercept through propagation o...

14 dagar ago | 0

| accepted

Answered
Issue with obtaining gradient from Qvalue critic using dlfeval,dlgradient,dlarrays
I really don't understand what you want me to do. In order for you to run it, I'd have to provide my whole project to you. Do yo...

14 dagar ago | 0

Answered
How to construct a curve to replace the projected part of another curve?
[x,y]=readvars('black thin line.xlsx'); [x,y]=splitapply( @(a,b)deal(mean(a),mean(b)), x,y, findgroups(x) ); sub=~(24.7<=x ...

15 dagar ago | 1

| accepted

Answered
Validating multi-start fmincon optimization
My main Q is that: does make sense to confirm the solutions form fmincon solver with global optimization like surrogateopt? It ...

15 dagar ago | 0

Answered
I am getting the error as " Not enough input arguments " and " Failure in initial objective function evaluation. FSOLVE cannot continue". Please suggest me possible solutions.
It is not clear from your code which variables are meant to be the 2 unknowns, and which are constants. In any case, your fun ne...

15 dagar ago | 0

Answered
Help with getting data from image at equidistant positions from the centre - to include the "off circle corners"
[M,N]=size(yourImage); c=[M+1,N+1]/2; %image center rho=hypot((1:M)'-c(1), (1:N)-c(2)); G=discretize(rho,0:2:norm...

16 dagar ago | 0

| accepted

Answered
differentiable approximation of bandwidth in ksdensity for optimization
ChatGPT offers the following:

16 dagar ago | 0

| accepted

Answered
Variables Unrecognized in parfor but Work in for Loop
I am aware of this, but I was hoping to avoid writing 'params.' to reduce clutter in my code. You might consider this File Exch...

20 dagar ago | 1

Answered
Variables Unrecognized in parfor but Work in for Loop
You should not be using eval to create new variables, regardless of whether the loop is parfor or a regular for loop, see also, ...

20 dagar ago | 1

| accepted

Answered
Can binarization be applied to a masked area only?
or if there is a way to discard evertyhing else outside the mask? Yes: Image=Image.*mask *Do I have to make a mask for each c...

21 dagar ago | 1

| accepted

Answered
Efficient access and manipulation of arrays in nested cells
There is no way to iterate over cells (nested or otherwise) without a loop, or something equivent in performance to a loop (cell...

21 dagar ago | 0

Answered
Error using trainNetwork (line 191) Invalid training data. The output size ([1 1 2]) of the last layer does not match the response size ([512 512 2]).
It doesn't make sense that you have a "mask" unless you are doing semantic segmentation (i.e. pixel-by-pixel classsifcation), an...

22 dagar ago | 1

Answered
Optimization stopped because the relative changes in all elements of x are less than options.StepTolerance = 1.000000e-06, but the relative maximum constraint violation, 9.999
Your ConstraintTolerance setting is extraordinarily large. Did you mean to have, ...'ConstraintTolerance', 1e-7)

22 dagar ago | 0

Answered
Nested fmincon call to solve min max optimization
To solve without nested optimization, reformulate as, which can be solved using ...

24 dagar ago | 0

Answered
How can i use symbolic variables in a parallel Computing (parfor)?
Dlu_11_1= zeros([M,N,N,M], 'sym') ; parfor t=1:(M*N)^2 [ki,kj,j,i]=ind2sub([M,N,N,M],t); Dlu_11_1(t)=d...

24 dagar ago | 1

| accepted

Question

Are dlnetworks supposed to be allowed to have output layers?
Are dlnetworks allowed to have output layers? In the following code, I manage to create one, so the answer would seem to be yes....

25 dagar ago | 1 answer | 0

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