MATLAB: Repeating elements of vector by the no. of times equal to elements in another vector

repmat

i have a vector v. i have another vector of same length, r. i want to take first element of v, v(1), repeat it r(1) times, store it in a big vector W. then i want to take second element of v, v(2), repeat it r(2) times, and append W with it. and so on until all elements in v are finished.

i want this:

W= [ [v(1) repeated r(1) times] [v(2) repeated r(2) times] …….[v(n) repeated r(n) times] ] where n is the length of r and v. How can i do this?

Best Answer

 repelem(v,r)

Related Solutions

MATLAB: Moving Norm using Vectorization

% Example input

v = rand(10,1);

% Window length

w = 3;

% Pad with zeros

o = zeros(w-1,1);
v = [o;v;o];

% Calculate index [0 0 a; 0 a b; ...]

pos = 0:numel(v)-w;
idx = bsxfun(@plus, pos.', pos(1:w)+1);

% Euclidean norm sqrt(a^2 + b^2 ...)

out = sqrt(sum(v(idx).^2,2));

MATLAB: Repeat elements of a vector as matrixes in a multidimensional array.

Hi Marius Adom,

If I understood your task correctly, you can use arrayfun() to create each x-y-Matrix and concatenate them using cat():

x = 4;
y = 3;
v = [1 2 3 4 5];
cOut = arrayfun(@(dIn,nInd) ones(x,y) .* dIn, v, 1:length(v), 'UniformOutput',false);
dOut = cat(3,cOut{:});

Kind regards,

Robert

Best Answer

Related Solutions

MATLAB: Moving Norm using Vectorization

MATLAB: Repeat elements of a vector as matrixes in a multidimensional array.

Related Question