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Matt J


5,776 total contributions since 2009

Professional Interests: medical image processing, optimization algorithms

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Answered
Is there a difference between declaring a class property "Dependent" versus "Dependent = true"?
Yes, they are equivalent. Also, you can do, properties(~Dependent) aProp end as an equivalent to, properties(Dependent=...

3일 ago | 1

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Answered
How to integrate an unbounded function?
You cantry use the symbolic toolbox, or you could just take the numerical integral over a sufficiently large finite interval. A ...

4일 ago | 0

Answered
Optimization solver: retrieval of Constraint matrices
Yes, use prob2struct, https://www.mathworks.com/help/optim/ug/optim.problemdef.optimizationproblem.prob2struct.html

4일 ago | 0

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Why output of rotation matrix in Camera Calibration is vector ? What do to convert to rotation matrix ?
A cameraParameters object also has a property that stores the rotations in matrix form https://www.mathworks.com/help/vision/re...

4일 ago | 0

Answered
Find constraints on polynomial coefficients optimization
It might be more natural here to use fseminf, x = fseminf(fun,[a1,a2,a3], 2, @(a,s) seminfcon(a,s,T,lb,ub)); function [c,...

4일 ago | 0

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Find constraints on polynomial coefficients optimization
What's to figure out? You've already articulated that the (nonlinear) constraints on the extremum are, 0<=-a2/(2*a1)<=T The on...

4일 ago | 0

Answered
fmincon generating (very) noisy results - initial guesses probably to blame
If you're suspicious about the initial point, I would recommend MultiStart, or just try lots of different initial guesses yourse...

4일 ago | 0

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Constraint of optimization problem
It's the wrong solver. You would need to use ga() for a problem like that.

5일 ago | 0

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Answered
How to normalise a FFT of a 3 variable function.
To normalize so as to obtain Discrete Fourier Series coefficients, divide by N=numel(input).

5일 ago | 0

Answered
How to normalise a FFT of a 3 variable function.
To normalize so that the continuous Fourier transform is approximated, multiply by the sampling intervals, dT1*dT2*dT3

5일 ago | 0

Answered
How to normalise a FFT of a 3 variable function.
To normalize so that Parseval's equation holds, divide by sqrt(numel(input)).

5일 ago | 0

Answered
Subtract according to the values in another column
[~,i]=unique([C1,C1(end+1)],'stable'); result = C2(i(2:end)-1)-C2(i(1:end-1))

5일 ago | 0

Answered
Can we use scatteredinterpolant in parallel
You can certainly divide queries into parallel batches, e.g., F=scatteredInterpolant(P,v); results=cell(size(batch)); parfo...

5일 ago | 0

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Can parallel computing toolbox not parallellise over multiple CPUs?
12 is the upper limit if you are using a version of Matlab earlier than R2014a, see also https://www.mathworks.com/matlabcentra...

6일 ago | 0

Answered
Conditional Skip in for loop
Apply the suggestions in this thread to A=logical(x)+1.

6일 ago | 0

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Answered
How to plot Intensity profile along the vertical line of an image
y = [0 size(I,1)]; x = [size(I,2)/2 size(I,2)/2];

6일 ago | 0

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Answered
Find first three numbers in a matrix that satisfy the condition x>0.001
B=find(A(:,1)>0.001,3)

6일 ago | 0

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Answered
Why do I get no solution found in Fsolve despite the results match my nonlinear equations ?
You're asking for guesses? Because you are not plugging the solution into the same equations that were given to fsolve. fsolve t...

9일 ago | 1

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Answered
Export residuals from curve fitting
Instead of using cftool, use the fit() command, [fitobject,gof,output] = fit(x,y,'poly1','Weights', w); residuals=output.res...

9일 ago | 0

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Answered
Export residuals from curve fitting
For a simple 1 degree polynomial, why not just use polyfit? p=polyfit(x,y,1); residuals=polyval(p,x)-y;

9일 ago | 0

Answered
error using fminbnd with multiple objective function
A few problems fminbnd cannot minimize functions of more than one unknown variable All Matlab minimization routines e.g. fmins...

9일 ago | 1

Answered
How can I NOT specify the constraint function in the ga function?
Any of the constraint arguments can be left empty to signify to ga that there are no constraints of that type, e.g., x = ga(fun...

10일 ago | 1

Answered
alpha shape vs convex hull volume value
Because the convex hull and an alpha shape are not necessarily the same shape. The alpha shape, in particular, depends on the al...

10일 ago | 0

Answered
How do I calculate the numerical Jacobian for a set of six non linear equations ?
Jac=nan(3,3); %pre-allocate Jac(1,:) = 2*[ x(1)-h1 , x(2)-v1 , x(3)-w1 ]; Jac(2,:) = 2*[ x(1)-h2 , x(2)-v2 , x...

10일 ago | 1

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Answered
How to loop a objective function using the optimization toolbox?
My objective function is built on the decision variable so that the objective function is for one time period as well. You cann...

10일 ago | 0

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Answered
Converged to an infeasible point. fmincon stopped because the size of the current step is less than the default value of the step size tolerance but constraints are not satisfied to within the default value of the constraint tolerance.
There are no feasible solutions to your problem because it is impossible to satisfy the first equality constraint, zeros(1,leng...

10일 ago | 0

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Answered
Calling variables into objective function
There is, but the far better way is to use anonymous or nested functions, as covered here https://www.mathworks.com/help/optim/...

11일 ago | 0

Answered
Issues about Using Function 'fmincon' solve Optimization Problem
tol = 1.0E-13; This is an incredibly tight tolerance - possibly at the limit of double float precision, depending on the order ...

11일 ago | 0

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Answered
Curve Fitting (polynomial fitting and interpolation)
fit() will return a fitobject, which you can use to evaluate the surface at any point you wish zq=fitobject(xq,yq) It's import...

11일 ago | 0

Answered
How to sum over 3 dimensional cell array, where each cell also contains cells?
I'm tempted to ask how this data got to be a cell array, when it should really have been a 3x6x6x645 numeric array. We can fix t...

11일 ago | 0

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