Upsampling a matrix with zero elements

Question

Alí Fernando Vela Pérez 2024-1-31

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https://ww2.mathworks.cn/matlabcentral/answers/2076486-upsampling-a-matrix-with-zero-elements

评论： Stephen23 2024-1-31

I have a matrix x = [1 2 3 4; 5 6 7 8] and I want to upsample it by 2 so it goes something like x = [1 0 2 0 3 0 4 0; 0 0 0 0 0 0 0 0; 5 0 6 0 7 0 8 0; 0 0 0 0 0 0 0 0]

Any suggestion??

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Answer 1

Dyuman Joshi 2024-1-31

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https://ww2.mathworks.cn/matlabcentral/answers/2076486-upsampling-a-matrix-with-zero-elements#answer_1400186

编辑：Dyuman Joshi 2024-1-31

在 MATLAB Online 中打开

%input
x = [1 2 3 4; 5 6 7 8] 
x = 2×4
     1     2     3     4
     5     6     7     8
%Upsample factor
n=2;
%preallocate the output matrix
y = zeros(n*size(x));
%assign values
y(1:n:end,1:n:end) = x
y = 4×8
     1     0     2     0     3     0     4     0
     0     0     0     0     0     0     0     0
     5     0     6     0     7     0     8     0
     0     0     0     0     0     0     0     0

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Stephen23 2024-1-31

+1 good MATLAB approach.

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Answer 2

Bruno Luong 2024-1-31

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x = [1 2 3 4; 5 6 7 8] 
x = 2×4
     1     2     3     4
     5     6     7     8
kron(x, [1 0; 0 0])
ans = 4×8
     1     0     2     0     3     0     4     0
     0     0     0     0     0     0     0     0
     5     0     6     0     7     0     8     0
     0     0     0     0     0     0     0     0

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Stephen23 2024-1-31

+1 very neat

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Answer 3

Anjaneyulu Bairi 2024-1-31

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https://ww2.mathworks.cn/matlabcentral/answers/2076486-upsampling-a-matrix-with-zero-elements#answer_1400166

编辑：Anjaneyulu Bairi 2024-1-31

在 MATLAB Online 中打开

Hi,

You can follow the below steps to upsample the matrix by 2.

Create a matrix with a double number of rows and columns with all zeros.
Now iterate over this new matrix, and for every odd iteration and odd position, assign the original matrix value.

Code for reference

x = [1 2 3 4;5 6 7 8];
[rows, cols] = size(x);
% Initialize the matrix with double number of rows and columns
new_matrix = zeros(rows * 2, cols * 2);
% Copy elements from the original matrix 'x' to the new matrix
for i = 1:rows
    for j = 1:cols
        new_matrix(2*i-1, 2*j-1) = x(i, j);
    end
end