Matt J

Last seen: Today

7,295 total contributions since 2009

Professional Interests: medical image processing, optimization algorithms

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Answered
Getting the "Error running optimization. Too many output arguments." when running fmincon with gradient option in derivatives.
Any idea on where the issue may be? It sounds like you have set SpecifyObjectiveGradient=true. However, it does not appear from...

1 day ago | 0

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Answered
Passing options from subclass constructor to superclass?
Can't you just convert the options structure back to a cell array of name value pairs and use that to call the super class cons...

1 day ago | 0

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How can I recognize a mesh of points on the same plane?
In this example there are 11 frames, which are 2D structures made up of points located on the same plane and that said plane is ...

1 day ago | 0

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Trying to get a function to apply to values in an array
One way to fix it, V=arrayfun(@(z)tank(10,z), d);

2 days ago | 1

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Answered
cftool and hyperdimensional data
It cannot, but lsqcurvefit can. https://www.mathworks.com/help/optim/ug/lsqcurvefit.html

2 days ago | 1

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How to Use "Ask a Question" Section Correctly?
Clearing cookies was sufficient for me.

2 days ago | 0

Question

Using CUDA mex files interoperably with gpuArray
I have a 3rd party black box CUDA mex file. Every time I use it, it puts my GPU in a state such that gpuArray cannot subsequentl...

2 days ago | 1 answer | 2

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Answered
How do I remove any Column in a matrix
Nothing is wrong with the code you've posted, but it would be simpler to do, B=A(:,[1:n-1,n+1:end]); or, slightly less effici...

3 days ago | 2

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Answered
How to convert a cell containing sub cells to a vector
A={{{rand(5,1)},{rand(7,1)}},{rand(3,1)}}; %Example Vector=A; while iscell(Vector) Vector=cellfun(@(c) c(:), Ve...

3 days ago | 0

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Answered
How does vectorized lsqcurvefit() calculate sum-of-square, row-wise or column-wise?
if ydata is m-by-n, then sum-of-squares should be m-by-1. No. The objective function minimized by lsqcurvefit is always just, ...

3 days ago | 1

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Answered
Column multiplication of two 2D matrices.
I am planning to take sum along the third dimension That would simply give you A*B.'

3 days ago | 1

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Column multiplication of two 2D matrices.
I doubt you will be able to do the computation with the matrix sizes you've indicated. The result will consume 3.5 TB of RAM in ...

3 days ago | 0

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multiple loop do not loop
for i=1:noofcol for j=1:noofrow

4 days ago | 0

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Rearranging a 512x64 matrix into a 32x1024 matrix
See reshape(). https://www.mathworks.com/help/matlab/ref/reshape.html

4 days ago | 0

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Variance when only one observation is not NaN
A=myTable.A; pastvarofA=movvar(A,[4,0],'omitnan'); pastNaNs=movsum(~isnan(A),[4,0],'omitnan'); pastvarofA(pastNaNs<=1)=na...

5 days ago | 0

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Answered
Performance of Parfor Loops
Because even when you use just 1 worker, the Matlab code will to some degree be able to use all 8 cores that you have. To see if...

5 days ago | 0

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EDITED: Variance when only one observation is not NaN
A=[1;2;3;NaN;5;5;6]; varofA = movvar(A,2,'Endpoints','discard')

5 days ago | 0

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Answered
Obtaining min value each month across several years
G=findgroups(filename(:,3),filename(:,4)); [mintemp,rowIndex]=splitapply(@func,filename(:,1),(1:numel(G)).',G) functio...

5 days ago | 0

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Answered
Problems running gpuArray function - CUDA driver
Make sure you've rebooted the computer after the installation.

5 days ago | 0

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Optimization objective funcion containing a sum
s=sign(sum(PV(1:n,1))); if s<=0, b=1; else, b=0; end

6 days ago | 0

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Optimization function with a summation
The solution is simply, b = zeros(144,5); b(PV(1:j)>0,:)=1;

6 days ago | 0

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optimization using problem based
Are you sure t should be an optimvar? It seems to me it should be a set of discrete known values t = linspace(0,Time,N) Once...

7 days ago | 0

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Error in fminsearch (line 200) fv(:,1) = funfcn(x,varargin{:});
Change the output of your function to a squared error over all 3 companies, or some other scalarization of the current output th...

7 days ago | 0

Answered
If I already had a function and some points(x,y), how can I find six parameters in a function?
fminspleas would be a good choice, https://www.mathworks.com/matlabcentral/fileexchange/10093-fminspleas seeing as 3 of your ...

7 days ago | 1

Answered
Find the symmetric and skew-symmetric matrices by 2x2 blocks
A=[ 0,-1, 2,3; 1,0, 4,2; -2,3, 0,-1; 4,-2, 1,0; ]; n=length(A)/2; mask = (-1).^( (1:2*n).' ...

8 days ago | 0

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Has MATLAB implemented a polygon offset function?
Sounds like you could do that with polybuffer https://www.mathworks.com/help/matlab/ref/polyshape.polybuffer.html and polyshap...

8 days ago | 1

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How to get fminimax work for both max and min objectives?
Using Sion's minimax theorem, the min and the max can be interchanged to give a much simpler problem, The solution to t...

9 days ago | 0

Answered
How to fit rectangles on blobs on binary image
regionprops(BW, 'BoundingBox')

9 days ago | 0

Answered
How to get fminimax work for both max and min objectives?
You could reformulate the problem as follows and solve the whole thing with fmincon. No non-differentiable minimizations require...

10 days ago | 1

Answered
How can I create a cell that splits a sequence of numbers (1 : n) in equal parts?
Using mat2tiles, https://www.mathworks.com/matlabcentral/fileexchange/35085-mat2tiles-divide-array-into-equal-sized-sub-arrays ...

10 days ago | 1

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