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Matt J


6,171 total contributions since 2009

Professional Interests: medical image processing, optimization algorithms

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Answered
Is possible configure matlab to get a+[ ]=a?
You could also replace your plus() operations with sum() operations. Compare: >> a=3; b=[]; >> a+b ans = [] >>...

1 day ago | 1

Answered
Is possible configure matlab to get a+[ ]=a?
No way that you're going like. You could subclass Matlab's double type https://www.mathworks.com/help/matlab/matlab_oop/extend-...

1 day ago | 1

Answered
Error using griddedInterpolant The grid vectors do not define a grid of points that match the given values.
You have 20 Y samples, but your V has 21 rows. >> whos X Y V Name Size Bytes Class Attributes V ...

1 day ago | 0

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Answered
Average of every nth value in a vector
tmp=conv(yourvector, ones(600,1)/600,'valid'); result=tmp(1:600:end)

1 day ago | 0

Answered
Add two lines to a matrix.
A=A([1;2;3;3;3],:)

2 days ago | 0

| accepted

Answered
3-D line of best fit from origin to cloud of data points
The equation is t*u where u is 3D line direction vector obtained by, [V,d]=eig(A.'*A,'vector'); [~,i]=max(d); u=V(:,i); and ...

2 days ago | 0

Answered
Multi-function optimization
You would need something like the following, options=optimoptions(@fminunc,'SpecifyObjectiveGradient', true); allX = fminunc...

2 days ago | 0

| accepted

Answered
2D Convex Hull: I can't think of a 'criteria' to filter out the 'wrong' points, please help!
One thing you can also try to do is find where one of the rays from the pivot point lies inside the triangle formed by its two n...

2 days ago | 0

Answered
Radon Transform Documentation Matlab
I understand the Radon Transform get the product between the length(intersection) of each beam through the pixel and the pixel ...

3 days ago | 1

Answered
Why do the values not get added into the array such as [2,3,5,7], but instead they get summed up?
Because you are using '+'. To concatenate, you would do, values = [values, tester];

3 days ago | 0

| accepted

Answered
Make squares in image white
imcomplement(A);

3 days ago | 0

| accepted

Answered
Cloud of points Convex Hull
See convhull or convhulln https://www.mathworks.com/help/matlab/ref/convhull.html https://www.mathworks.com/help/matlab/ref/co...

3 days ago | 0

Answered
Using one variable containing all name-value pairs for built-in Matlab functions
See inputParser https://www.mathworks.com/help/matlab/ref/inputparser.html which by default will expand structures into Name-V...

3 days ago | 0

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Answered
How can i find a certain vector in a matrix?
[~,loc]=ismember(vector.',Matrix.','rows');

3 days ago | 1

Answered
How to make difference between two cell array?
fun=@(c) num2str(c,'%.20d '); A=cellfun(fun,NS,'uni',0); B=cellfun(fun,setL,'uni',0); [~,ia]=setdiff(A,B); result=NS(ia)...

3 days ago | 0

Answered
Calculate only diagonal elements of multidimensional array product
Since M is small, a for-loop would probably also be fine, [j,k]=sub2ind([M,M],1:M.^2); for i=1:M^2 B(j(i),k(i),:)=B...

3 days ago | 0

Answered
Calculate only diagonal elements of multidimensional array product
Assuming your Matlab version is post-R2016b reuslt = sum(B.*A.',1) Otherwise, assuming your Matlab version is post-R2008 resu...

3 days ago | 0

Answered
Least Square Minimization (Levenberg-Marquant method) of damped oscillation curves
You can use lsqcurvefit with the 'levenberg-marquardt' Algorithm setting https://www.mathworks.com/help/optim/ug/lsqcurvefit.ht...

3 days ago | 0

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Answered
Need help with subspace basis
You could just use orth()

4 days ago | 0

Answered
Phantom Variable within Object Method Calls
You must decide whether you want your classes to be handle classes or value classes. https://www.mathworks.com/help/matlab/matl...

5 days ago | 1

Answered
Solve non-linear equation.
You can tell fzero to bound the search to a desired sub-interval. >> fzero(Equation_fun,[0,pi/2]) ans = 0.4012 >>...

5 days ago | 1

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Answered
Passing built fun tion to fminunc
[xf, ff] = fminunc( @(x) fun( x(1),x(2),(3),x(4) ),x0);

5 days ago | 0

Answered
Keep getting error message "Dimensions of arrays being concatenated are not consistent." but not there if I changed the parameters
These lines will only work if V2 is always a scalar. V2 = double(solve(Ppeng(T1(n),V) == PC,V,'Real',true)); V1 = [V1,V2];

8 days ago | 0

Answered
Calculating median along specific dimension of 3D array
M=nan(90,1,1633); for i=1:90 M(i,:,:)=median(S(i,:,:),2); end

8 days ago | 0

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Answered
How to join matching rows of cells in a particular column order
Not sure why you're working with cells, rather than tables, but it's easy enough to switch back and forth. A=cell2table(a); ...

15 days ago | 0

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Answered
fsolve and "Equation solved, fsolve stalled"
It means stopping criteria for the iterations were met. Fsolve cannot find a reason to continue.

15 days ago | 0

Answered
Orthogonal vectors, how to code?
Any two such vectors will have this parametric form, w= [0 cos(theta) sin(theta)] v=c*[0 -sin(theta) cos(theta)] where c=+1 ...

15 days ago | 0

Answered
comparing 3x3 block with center pixel
Here, X is the input matrix. result=0; result=result+1*rot90(fkernel(rot90(X,+1)),-1); result=result+2*rot90(fkernel(rot90(X,...

15 days ago | 2

| accepted

Answered
Can someone propose some code that will "connect the dots" using circular arcs?
I have attached a version of TripletGraph.m which implements methods of joining the points with ideal circular arcs, as well as ...

17 days ago | 0

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