How to index a specific column in a Cell

Question

Lutz 2023-1-8

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1890322-how-to-index-a-specific-column-in-a-cell

评论： Lutz 2023-1-9

Hey guys,

I have a cell wich contains different parts of a audiosignal. In every part of the cell is a column with the timestamps and a data column.

I want to write .wav files out of them and only need the data column. I tried alot of things but at this point im super confused and think that i can`t see the forest because of the trees anymore.

Thats how i created the cell:

data_store{ci} = [xx(:) yy(:)]; % 2 columns : time / data

thats my loop to write it, but with the time column:

folder = 'C:\XXX\Soundanalyse\Spectro_Analysis\Tones\Single_Tones\'
for i = 1:length(struct)
    file = fullfile(folder, sprintf('JD(%d).wav', i));
    audiowrite(file, struct(i).tones, Fs);
end

I thought also about putting it with cell2mat into variables to go from there but for me it looks a bit weird to have the extra step inside...

Thats how the cell looks from the inside:

Thanks guys!

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Answer 1

dpb 2023-1-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1890322-how-to-index-a-specific-column-in-a-cell#answer_1143947

在 MATLAB Online 中打开

Dereference the cell, then index into the resulting array...

c=[{[[0:3].' rand(4,1)]} {[10+[0:3].' rand(4,1)]}]
c = 1×2 cell array
    {4×2 double}    {4×2 double}
c{2}(:,1)       % time of second cell
ans = 4×1
    10
    11
    12
    13
c{2}(:,2)       % and the data
ans = 4×1
    0.1808
    0.5277
    0.1604
    0.0784