MATLAB: I have a piece of code and can anyone explain how it works

denoising

function A=blow(B) % B is a greyscale image

[n,m,c]=size(B)

n=2*n;m=2*m; A=zeros(n,m,c);

A(1:2:n,1:2:m,:)=B; A(1:2:n,2:2:m,:)=B; A(2:2:n,1:2:m,:)=B; A(2:2:n,2:2:m,:)=B;

return;

Best Answer

It replicates each pixel to 2x2.

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MATLAB: Split a specific matrix in 4 equal parts

M = rand(8) ; 
[m,n]  =size(M) ; 
A = M(1:n/2,1:n/2) ; 
B = M(1:n/2,n/2+1:end) ;
C = M(n/2+1:end,1:n/2) ; 
D = M(n/2+1:end,n/2+1:end) ;

But the best would be:

m  =size(M,1)/2 ; 
A = mat2cell(M,[m m],[m m]) ; 
A{1,1}
A{1,2}
A{2,1}
A{2,2}

MATLAB: How to change 3d array to 2 d array

a = ['A'; 'B'; 'C'; 'A'; 'B'; 'C'];
b = [1; 1; 1; 2; 2; 2];
c = ['N'; 'J'; 'N'; 'J'; 'N'; 'J'];
T = table(a,b,c)
T_new = unstack(T,2,1)

results in:

T =
  6×3 table
    a    b    c
    _    _    _
    A    1    N
    B    1    J
    C    1    N
    A    2    J
    B    2    N
    C    2    J
T_new =
  2×4 table
    c    A    B    C
    _    _    _    _
    N    1    2    1
    J    2    1    2

Best Answer

Related Solutions

MATLAB: Split a specific matrix in 4 equal parts

MATLAB: How to change 3d array to 2 d array

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