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Matt J


5.357 total contributions since 2009

Professional Interests: medical image processing, optimization algorithms

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Answered
Using MATLAB on multiple devices with one account
I would say the best/cheapest option is to install a student license on your home computer and connect to that computer (by Remo...

alrededor de 4 horas ago | 0

Answered
non overlapping random circles
Perhaps one of these FEX contributions would be helpful.

alrededor de 9 horas ago | 0

Answered
Undefined function or variable 'drawellipse'
drawellipse wasn't introduced until R2018b.

alrededor de 10 horas ago | 1

| accepted

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Find clusters with specific value in 3D matrix
S=regionprops(yourImage<0.05,'Area','PixelIdxList'); S=S([S.Volume]>=30); result=zeros(size(yourImage)); for i=1:numel(S)...

alrededor de 11 horas ago | 0

Answered
Product of elements in an array
For example, >> x=[3 5 7 11]; >> prod(nchoosek(x,3),2) ans = 105 165 231 385

alrededor de 12 horas ago | 0

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How to find the coordinates of the white square ?
Some simple morphological operations are all you need. A=imbinarize((imread('image.jpeg'))); A=bwareafilt( imopen(A,strel...

alrededor de 13 horas ago | 0

Answered
Calculating dot product of 2 3 dimensional row vectors
I think this is what you want: x=input('Enter the 1st pair of 3 vector elements in [square brackets]: '); if (numel(x)~=3); ...

alrededor de 14 horas ago | 0

| accepted

Answered
issorted alternative for optimization toolbox
You can do, prob.Constraints.sorted = ( A(2:end) <= A(1:end-1) );

alrededor de 14 horas ago | 0

Answered
The "fslove function" got different answer on two computers
Have you checked whether both results are valid solutions to the equations? If a continuum of solutions exists, it is quite conc...

alrededor de 17 horas ago | 0

Answered
fft definition in matlab doc puzzling
Your second definition only makes sense if you define the indexing in Y(k) to be modulo-n. Otherwise, it is not clear what it me...

1 día ago | 0

Answered
How to fix this error in interpolation?
interp1 is complaining that y3 has repeated elements. They are required to be unique and monotonic.

1 día ago | 0

Answered
How to sum multiple matrice in loop ?
Is this what you want? result = squeeze(sum(T3,3)); If not please clarify what the dimensions of the final result should be.

1 día ago | 0

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Imprecision problem: pinv(H) is not equal to pinv(H'*H)*H'
Seems to me the obvious solution is not to push gamma to infinity. That removes the regularization whose purpose is precisely to...

1 día ago | 0

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Outer product of two rectangular matrices
outer = r(:)*r(:).'

1 día ago | 0

Answered
Using other solvers for models generated by optimproblem
You can use prob2struct to help convert a problem-based description of the linear constraints to the matrices required by other ...

2 días ago | 2

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Answered
Plotting shapes based on equations and weights.
For 2D and 3D functions, you can use fimplict and fimplicit3, e.g., fimplicit(@(x,y) w0+w1*x+w2*y)

2 días ago | 0

Answered
What is the equivalent of the function 'wait' after using 'imellipse' for the new function 'drawcircle' (version R2018b)?
Here's a (ch)easy workaround using the waitfordoubleclick.m file attached drawcircle; waitfordoubleclick You may have to adjus...

3 días ago | 0

| accepted

Answered
Multiple regression with multiple variations
e=ones(size(x1)); abcdef = y/[e;x2;x3;1./x1;x2./x1;x3./x1] abcdef = 6.3301 0.0113 -0.0117 88.7676 -0.8784...

4 días ago | 0

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Answered
assigning a variable to an output of a function at a certain time
t=1; yone=yourFunction(t);

4 días ago | 0

Answered
Linear and Non-Linear constraint Optimization
Yes, c and ceq can be vectors (or matrices, or arrays of any dimension...).

4 días ago | 0

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Answered
Specifying some but not all Nonlinear Constraint Gradients through Fmincon
I agree, it would be nice if the Optimization Toolbox would expose its finite differencing code as a separate function, so that ...

5 días ago | 0

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Answered
innerjoin invalid parameter name
It appears that you are attempting to do the following: Akeys={'DateAnnounced','TargetName','AcquirorName'}; Bkeys={'DateAnnou...

5 días ago | 0

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Answered
How to Show 1/4 in 1/2^2?
You can also create symbolic numbers sym(1/3) 1/3 but be mindful that all calculations you do with such numbers will also giv...

6 días ago | 1

Answered
GPU Recommendation for Parallel Computing
Well, the one general thing I can say is that if you convert all of the variables data1...data5 variables to gpuArray objects, t...

6 días ago | 0

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Answered
vectorize the following loop
Hint: logical indexing might be helpful here.

6 días ago | 0

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Questions about Multi Objective Linear Programming (MOLP) with 'fminimax'
I have concerns that if I change the values on the myfun (e.g., 7104057.18 , 1334616299.17) in terms of changing decimal, the 'X...

6 días ago | 0

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Assigning new matrix values from another matrix's rows
I would just convert the bits into a single integer index, index=triplets*[4;2;1]; and then perform lookup into an appropriate...

7 días ago | 0

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Answered
error for 'fmincon' for global optimization
It's a case sensitivity issue. Instead of 'LB' and 'UB', pass in 'lb' and 'ub'.

7 días ago | 0

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Answered
How to state the compass direction between two coordinates
You would do angle=atan2d(d-b,c-a); and then, based on the numeric value of angle, assign a compass direction:

7 días ago | 0

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Answered
Points Translation and finding correct normal direction
Compute the vector V from the centroid to each of your points and correct the orientation of the gradient as follows gradient ...

7 días ago | 0

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