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Matt J


5.841 total contributions since 2009

Professional Interests: medical image processing, optimization algorithms

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Answered
How to trim segments to fit a square
One solution is to use intersectionHull() from here https://www.mathworks.com/matlabcentral/fileexchange/30892-analyze-n-dimens...

alrededor de 3 horas ago | 0

Answered
ismembertol does not work as documented
The documentation isn't wrong. You've set a tolerance that can only satisfied reliably at A(6) in infinite precision arithmetic....

alrededor de 3 horas ago | 0

Answered
rotation constraint in imregtform
I don't have a clear picture of the "skips" you are refering to, but it vaguely sounds like it could be addressed by setting the...

alrededor de 5 horas ago | 0

Answered
How to speed up function approximation?
There are a few inefficiencies that I see. Firstly, you shouldn't pick an arbitrary StartPoint like [0.8,0.8]. The problem can b...

1 día ago | 1

| accepted

Answered
Fit NonLinearLeastSquares to data and constrain curve to pass through point (0,1)
This answer incorporates Torsten's advice, but I also think you should re-formulate the model to make the exponential terms asym...

1 día ago | 0

Answered
Right-truncating a lognormal distribution
I think this is right. How can I code this? function out=conditionalCDF(a,b,x,beta,sigma) pa=normcdf(log(a)-x*beta,0,sig...

2 días ago | 1

| accepted

Answered
Coordinate system of matlab
However, i read that Matlab uses two types of coordinate systems which i find really frustrating and confusing at the same time....

2 días ago | 0

| accepted

Answered
How to find the area of the object in the center?
impoly worked pretty well for me. The area in pixels was 1358238 h=impoly(); area=numel(h.createMask) % 1358238

4 días ago | 1

| accepted

Answered
Plot feasible region of a high-dimensional linear programming along some dimensions
I tried to use this without success ... which stops with a long error message that I'm struggling to intepret. The error mess...

4 días ago | 0

Answered
Quadratic Programming (quadprog):
Using your posted A matrix I find that >> cond(H) ans = 7.5703e+18 For numerical purposes, this is a singular matrix ...

4 días ago | 0

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Answered
Increasing the bounds of integration on a strictly positive function decreases the result
A plot of the function reveals highly oscillatory behavior in the interval [-2e-6,0] which then flattens out to zero in [-1,-2e-...

4 días ago | 0

| accepted

Answered
Can multiple classes share external methods without inheritance?
Is it possible to have external methods that multiple classes share? It sounds like the "external methods" you are trying to im...

4 días ago | 1

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How do I help quadprog converge?
Is checking that the constraints are satisfied and the optimality measure is low a good rule of thumb for making this decision? ...

5 días ago | 0

Answered
How to find mean line of the this edge?
Try bwskel

7 días ago | 0

Answered
Insert desired number of spaces in the string contains numerical value
How about txt="0 STR "+1

7 días ago | 0

Answered
Regression of a vector in a optimization problem
As the others have said, all regression routines in the Optimization Toolbox allow you to represent the unknown variable in vect...

8 días ago | 0

| accepted

Answered
abstract class with inherite handle class
You cannot create an instance of an abstract class. Also, your constructor expects arguments EEG and INFO, which you have not pr...

10 días ago | 1

Answered
indexing takes a very long time
It takes a long time because every time you execute the line b = A(i:i+10,i+10,:) memory is allocated for b. Instead of itera...

10 días ago | 0

Answered
How to setup gamultiobj to "explore farther" along a specific objective?
Maybe redefine Obj2 so that it jumps from 16.6 to infinity, Obj2 = Obj2-1+1/(Obj2<16.6)

10 días ago | 0

Answered
Loss function in CNN
I expect you might have to feed the hidden layer outputs forward, making them inputs/outputs of your custom output layer. That w...

12 días ago | 0

Answered
How to add an extra column to a 1x1 structure
I can't be sure from your description exactly what you are trying to do, but it sounds like a table might be much better for wha...

12 días ago | 0

Answered
Extracting part of an image
Use impoly instead of drawpolygon. Use the createMask() method of the impoly object h to extract the ROI pixels pixelvalues = y...

12 días ago | 0

Answered
How to find out the cordinates of the intersection point of a line and a surface?
Plug the equation for the line into the equation for the surface and use fzero to find the root. This root will give the locatio...

22 días ago | 1

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Answered
How to make a long equation line more efficient?
I thought this should help because I have hundreds of these instances If the expression came from matlabFunction, be sure you a...

22 días ago | 0

Answered
Finding threshold for skull segmentation of Head CT images
What about multithresh()?

22 días ago | 0

| accepted

Answered
"fmincon" optimization with nonlinear constraints: colon error
You are returning a function handle in c_eq, when really you should be evaluating the function at Cpv, c_eq = Anonymous(Cpv); ...

22 días ago | 0

| accepted

Answered
Fast 2D distance calculation
If you have the Parallel Computing Toolbox, you can execute the computations on the GPU just by building p1 and pn as gpuArrays....

22 días ago | 0

Submitted


Structure fields to variables
Code writing tool for importing/exporting workspace variables to or from a struct.

23 días ago | 29 downloads |

Answered
Can I Dynamically Overload A Class Method?
You can't dynamically overload a class method, but you can get the same effect by making function handle properties that dictate...

23 días ago | 0

Answered
Division by an OptimizationVariable not supported.
The problem-based solver is largely limited to linear and (in R2019) quadratic programs. If you find yourself computing non-line...

24 días ago | 0

| accepted

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