MATLAB: I want to vertically concatenate 8 matrices. They are all 3 columns, but they have different lengths. I don’t care about this, as I just want to make one very long matrix of three columns. padcat doesn’t seem to work. Thanks!

matrix

the matrices are called m0,m1,m2,m3,m4,m5,m6,m7. m0 is a matrix with three columns and 28500 rows, ie [28500×3]. m1 is [27948×3], m2[28444×3], m3 is [27894 x 3] … etc. I want to make one [longx3] matrix. Thanks so much!

Best Answer

 result = vertcat(m0,m1,m2,m3,m4,m5,m6,m7)

result = [m0;m1;m2;m3;m4;m5;m6;m7]

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MATLAB: How tonterlace / Interleave 3 or more Matrices in MATLAB

See if this works

ar = cellfun(@(x)size(x,2),data);           % number of columns in each matrix
mm = size(data{1},1);                       % number of rows (the same for each matrix)
nn = max(ar);                               % max number of columns
D = zeros(mm,sum(ar));                      % preallocation of BIG MATRIX
k = 1;                                      % counter of column in BIG MATRIX
for j = 1:nn
    for i = 1:numel(data)-1
        if j <= ar(i)                       % if column exists
            D(:,k) = data{i}(:,j);          % fill BIG MATRIX
            k = k + 1;
        end
    end
end

MATLAB: Convert cell into double with diferent cell sizes

You can my PADCAT function to concatenate vectors with different lengths. It is available at the Matlab File Exchange:

https://uk.mathworks.com/matlabcentral/fileexchange/22909-padcat-varargin-

However, there are simpler ways to get the output res, from A:

A = [1,2;2,4;3,NaN;NaN,5;NaN,7]
res = repmat(1:size(A,1),size(A,2),1)' ;
res(isnan(A)) = NaN
res = sort(res)

Best Answer

Related Solutions

MATLAB: How tonterlace / Interleave 3 or more Matrices in MATLAB

MATLAB: Convert cell into double with diferent cell sizes

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