MATLAB: Dataset transformation

transformation

Hello,

Is there a fast way to transform a 2000×100 dataset into a 1×200000 dataset?

Thanks!

Best Answer

Do you mean dataset in the sense of just an array, or do you mean dataset as in the Statistics (or Database?) toolkit?

If D is a matrix, then

D(:).'

would be 1 x numel(D) with the elements column-first.

reshape(D.',1,numel(D))

would be 1 x numel(D) with the elements row-first.

Related Solutions

MATLAB: Command to reshape matrix diagonally

% X - array with size [5541888 x 7]
% m2 - number of rows in second array, m2 = 1536
[~,n] = size(X);
out = reshape(permute(reshape(X',n,m2,[]),[1 3 2]),[],m2)';

[m,n] = size(X);
a = mat2cell(X,m2*ones(m/m2,1),n);
out = [a{:}];

MATLAB: Compare matrices built with repelem and repmat

The transformation

c = repmat(a, [1,1,A,A]);
d = c(:,1,:,:);

is an indirection to reproduce b.

Z = 2;
W = 3;  
A = 4;  % Smaller to check the output manually
a = rand(Z, W);
b = repelem(a(:,1),A,A);
c = reshape(repmat(a(:,1).', [A, A]), Z*A, A);
isequal(b, c)

But if you really want

c = repmat(a, [1,1,A,A]);
d = c(:,1,:,:);

Then:

f = reshape(permute(d, [3,1,4,2]), [Z*A,A]);
isequal(b, f)    % 1: equal

Best Answer

Related Solutions

MATLAB: Command to reshape matrix diagonally

MATLAB: Compare matrices built with repelem and repmat

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