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Matt J


Last seen: Today
6 370 total contributions since 2009

Professional Interests: medical image processing, optimization algorithms

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Answered
Custom CUDA kernels and gpuArrays
Have a look at the documentation for CUDAKernel objects https://www.mathworks.com/help/parallel-computing/run-cuda-or-ptx-code-...

ungefär 21 timmar ago | 1

| accepted

Answered
Redistribution of elements of various arrays into a single multidimensional one
I think the loop you've shown would work just fine, but a quicker way would be array2=repelem(reshape(array1,1,1,[]), 200,4);...

ungefär 23 timmar ago | 1

Answered
discrte to softmax : Attempt to grow array along ambiguous dimension
I know its caused becouse target is larger then array but please help how i should change my code to make it work Did you inten...

en dag ago | 0

Answered
Max of vector in higher dimensional array subject to constraints
N=ndims(A); %A is the given matrix z=size(A,N); idx=reshape(1:z, [ones(1,N-1),z] ) < constraint; %requires R2016b or h...

en dag ago | 1

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Answered
How to generate random integer from 1 to N except some integers in between?
No loops required, N=10; b=3; M=5; %example data list=setdiff(1:N,b); selection=list(randperm(N-1,M)) %result

en dag ago | 1

| accepted

Answered
Matrix consisting of sub-elements of another matrix
By indexing,e.g., >> x = [ 1 2 3 4 5 6 7 8 9]*10; >> y=x([1,2,4,5,9]) y = 10 20 40 50 90

en dag ago | 0

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Answered
How to create an object using class name
function newObj = createNewObject(obj) newObj = feval( class(obj) ); end

2 dagar ago | 0

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Answered
Adding just one line in my code slows the GPU.
Pre-allocate on the GPU. Also, pre-compute things on the GPU that are easily vectorized and don't depend on r. R=gpuArray.zeros...

2 dagar ago | 0

Answered
Converting a row to diagonal matrix
Did some guessing as to what you meant, but I think this is what you want: A=tril(true(16),-1); B=double(A); B(A)=rowdata; ...

2 dagar ago | 0

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Answered
Find minimum of a 15x100 and return in a vector of 1x100. is this possible?
The names of the variables you wrote to the table Min_AS,Med_AS,Max_AS are different from the original variable names you show...

2 dagar ago | 0

Answered
Solve equations in a loop with fsolve
Your equations are quadratic and therefore generally have two solutions, s. Fsolve cannot find them both for you. Why aren't you...

2 dagar ago | 0

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Answered
Any idea how to do and represent ttest results on box plot?
Usually, I just overlay them in powerpoint. But if you must automate this, one not too difficult way would be to use the line co...

3 dagar ago | 0

Answered
changing a group of numbers in a vector
As an example, >> cycles=[0,1,0,1,0,1]; %3 cycles >> A=repelem(cycles,3) A = Columns 1 through 16 0 0 ...

5 dagar ago | 0

Answered
How to replace a vector element with a value not equal the other vector values?
function sudokuRow = fillSudokuRow(sudokuRow) idx=(sudokuRow==0); sudokuRow(idx)=func(sudokuRow(~idx)); end

5 dagar ago | 0

Answered
Passing parameter values found in lsqcurvefit to be initial values for parameter estimation in another function
Some possibilities, Combine the code from both fitting steps into a single script. That way you will have direct access to the ...

5 dagar ago | 0

| accepted

Question


Is there a danger in renaming a Matlab install folder
I have Matlab R2019b installed under Windows 10 in the usual place, C:\Program Files\MATLAB\R2019b but I would now like to ren...

5 dagar ago | 2 answers | 1

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answers

Answered
Speeding up nested for-loops when vectorization seems to fail
Getting rid of repmat (requires R2016b or later) and working with single float precision will get you some speed-up. In doubles...

6 dagar ago | 0

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Answered
Speeding up nested for-loops when vectorization seems to fail
I tend to think you should be using scatteredInterpolant rather than implementing your own interpolation routine with loops.

6 dagar ago | 0

Answered
lsqcurvefit does not match data
Your model is clearly wrong, assuming that the given data is valid. In your current model, saturation is always 0 when displacem...

7 dagar ago | 0

| accepted

Answered
Row & Column Wise Normalisation
For a non-negative square matrix, the attached article mentions necessary and sufficient conditions (p. 3, Theorem 1) both for t...

7 dagar ago | 2

| accepted

Answered
How to move programmatically existing datatip
Maybe you can use the advice here, https://www.mathworks.com/matlabcentral/answers/100545-how-can-i-programmatically-control-mo...

7 dagar ago | 1

Answered
How to solve Too many input arguments error? Error in Fminsearch (line 200) fv(:,1) = funfcn(x,varargin{:});
This fh handles should be, fh{n}= @(x)vpe(x,p,MSM(:,n),erps(:,n),n);

8 dagar ago | 0

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Answered
A is a matrix of size 32*32.I want to subtract elements of each 4*4 block of A from their respective 4*4 means
out = blockproc(A,[4 4],@(x)mean(x.data(:))); result = A - repelem( out , 4,4);

8 dagar ago | 0

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Answered
Reducing repeated elements in an array by a factor
Another method, one which avoids for-loops inherent in cell2mat, V=[1,2,2,2,0,2,2,2,5,5,5,5,5,5,6,6,6]; N=3; X = cumsum...

8 dagar ago | 0

Answered
The support on here is horrible, does anyone have an api for the function calls? I'm tired of searching only to find examples of what I don't need.
Matlab Answers is a discussion forum, not a documentation browser. If you want to find documentation, start here, https://www.m...

10 dagar ago | 2

Answered
How to use fimplicit with a symbolic function
Using matlabFunction, you can derive a non-symbolic version of your circle equation expression from the symbolic version, >> ci...

10 dagar ago | 0

Answered
How can I get the elements from a matrix and use them as the coordinates in another matrix
D = C( sub2ind( size(C), W(:,1:end-1), W(:,2:end) ) ), sum(D,2)

10 dagar ago | 0

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Answered
A class to simulate missing arguments in function calls
The main drawback is that one must always use myfeval, which is not very readable. Yet another solution, which might address th...

10 dagar ago | 0

Answered
Multiple selection of an array
You can use sepblockfun downloadable from here https://www.mathworks.com/matlabcentral/fileexchange/48089-separable-block-wise-...

10 dagar ago | 0

Answered
A class to simulate missing arguments in function calls
Clearly, I would have to check for each input argument to be ~isempty(), or ~isnan(), which could be another technique. However,...

13 dagar ago | 0

| accepted

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