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Matt J


Last seen: Today
6 374 total contributions since 2009

Professional Interests: medical image processing, optimization algorithms

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Answered
Same number of Rows and Cols of a matrix (N*N)
validateattributes(A,"numeric",{"square"})

environ 18 heures ago | 0

Answered
Constrained Global Optimization Problem with MultiStart, GA and HybridFunction using Parallel Processing whithout Step
A=input('Enter Matrix A: ') B=input('Enter Matrix B: ') C=input('Enter Matrix C: ') n=length(A); Con=cell(1,n); Obs=Co...

environ 19 heures ago | 0

Answered
How to do a matrix from vectors
One way, A=cell2mat( cellfun(@single,{time1 time2 Hs_buoy Tm_buoy Dm_buoy},'uni',0) )

environ 19 heures ago | 0

Answered
how can i split a 400*400 matrix into smaller one
You could do it as below, with the help of mat2tiles, https://www.mathworks.com/matlabcentral/fileexchange/35085-mat2tiles-div...

1 jour ago | 0

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-...

3 jours 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);...

3 jours 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...

3 jours ago | 0

| accepted

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...

4 jours ago | 1

| accepted

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

4 jours 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

4 jours ago | 0

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

4 jours 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...

4 jours 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; ...

4 jours 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...

4 jours 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...

4 jours 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...

5 jours 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 ...

6 jours 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

6 jours 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 ...

7 jours 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...

7 jours ago | 2 answers | 1

2

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...

8 jours 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.

8 jours 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...

9 jours 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...

9 jours 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...

9 jours 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);

9 jours ago | 0

| accepted

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);

10 jours ago | 0

| accepted

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...

10 jours 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...

11 jours 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...

12 jours ago | 0

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