How to fill a matrix from 11,000x43 to 32,000x43 with Nans in order to concatenate arrays?

Question

Andres Ulloa 2022-8-3

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1773350-how-to-fill-a-matrix-from-11-000x43-to-32-000x43-with-nans-in-order-to-concatenate-arrays

编辑： Andres Ulloa 2022-8-3

I am trying to generate a 3D array with 100 different files, however there are 30 files that are 11,000x43 and 70 that are 32,000x43. I would like to be able to make them the same size so I can concatenate them.

This is my example:

close all; clear all
P = 'D:\2021\datos_cozumel\DatosADCP2\';
S = dir(fullfile(P,'S1*.mat'));
S = natsortfiles(S); 
for k = 1:numel(S)
    F = fullfile(P,S(k).name);
    L = load(F);
    v1(k).data = L.Data.Burst_VelBeam1; 
end
vb1 = permute(cat(3,v1.data),[1,3,2]);
save('velbeam1_3.mat','vb1')

....

Thanks for your help

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Answer 1

Image Analyst 2022-8-3

1
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1773350-how-to-fill-a-matrix-from-11-000x43-to-32-000x43-with-nans-in-order-to-concatenate-arrays#answer_1020585

在 MATLAB Online 中打开

Why do they have to be nan? Can they be zeros? If so the easy way is

close all; 
clear all
folder = 'D:\2021\datos_cozumel\DatosADCP2\';
S = dir(fullfile(folder,'S1*.mat'));
S = natsortfiles(S); 
for k = 1:numel(S)
    fullFileName = fullfile(folder,S(k).name);
    % Load the mat file.
    L = load(fullFileName);
    % Get the image from the recalled structure.
    thisMatrix = L.Data.Burst_VelBeam1;
    % Check it's size, expanding if necessary.
    if k == 1
        [rows, columns, numberOfColorChannels] = size(thisMatrix);
    else
        [rowsk, columnsk, numberOfColorChannelsk] = size(thisMatrix);
        if rowsk < rows || columnsk < columns
            % This matrix is smaller.  Expand it to the same size as the
            % first image.
            thisMatrix(rowsk, columnsk) = 0;
        end
    end
    % Assign to the data field of the k'th structure.
    v1(k).data = thisMatrix; 
end
vb1 = permute(cat(3,v1.data),[1,3,2]);
save('velbeam1_3.mat','vb1')