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Matt J


6.182 total contributions since 2009

Professional Interests: medical image processing, optimization algorithms

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Answered
Find an optimal solution for a system with matrix
f=-A(:); Aineq=[B(:),C(:)].'; bineq=[4;3] Xoptimal=linprog(f,Aineq,bineq)

circa 9 ore ago | 0

Answered
Trying to plot Eulers, but keep getting straight line
You're getting a straight line because the right hand side of this line acmi(1:10001)=-a+(alpha(n)*l*cos(theta(n)))-((omega(n)^...

1 giorno ago | 0

Answered
how to write a function for quadratic equation
[x1,x2] = QuadraticEquation (1,-2,0) function [x1,x2] = QuadraticEquation (a,b,c) d=b^2-4*a*c; if d>=0 disp ('...

1 giorno ago | 0

| accepted

Answered
How to sum a series of numbers?
sum(numerator./denominator)

1 giorno ago | 0

Answered
multi-variable optimization in matlab?
Many other variables are to be calculated first, which are actually functions of the first two variables, and then they're used ...

1 giorno ago | 0

| accepted

Answered
Call a function in a sub directory?
The only way, I believe, is to visit each folder and create a function handle to each respective version of sayhi(), cd folder1...

1 giorno ago | 0

Answered
Map a 2D matrix into 3D using loop for allotment along the 3rd dimension
You could try this. clear data_trialwise for i=20:-1:1 data_trialwise(:,:,i)=data(:,begin(i):end(i)); % begin and end bot...

1 giorno ago | 0

Answered
shifted triangular matrix array
ac=num2cell([0,0;a],2); T=toeplitz(1:4,[1,zeros(1,3)]); A=cell2mat(ac(T+1)) A = 1 2 0 0 0 ...

1 giorno ago | 1

| accepted

Answered
How can i multiply cell arrays?
for i=1:2 for j=1:2 H{i,j}=H{i,j}.*X{i}; end end

1 giorno ago | 0

| accepted

Answered
Most efficient way to enter values into pre-allocated sparse matrix?
I would just store all the data from the loop calculations in cells. Then use the data to build the sparse matrix after the loop...

1 giorno ago | 0

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 = [] >>...

4 giorni 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-...

4 giorni 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 ...

4 giorni 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)

4 giorni ago | 0

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

5 giorni 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 ...

5 giorni ago | 0

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

5 giorni 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...

5 giorni 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 ...

5 giorni 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];

6 giorni ago | 0

| accepted

Answered
Make squares in image white
imcomplement(A);

6 giorni 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...

6 giorni 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...

6 giorni ago | 0

| accepted

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

6 giorni 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)...

6 giorni 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...

6 giorni 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...

6 giorni 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...

6 giorni ago | 0

| accepted

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