Want to writetable to tables stored in a cell array.

Question

Craig Saunders 2020-7-30

0
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https://ww2.mathworks.cn/matlabcentral/answers/572791-want-to-writetable-to-tables-stored-in-a-cell-array

回答： Neeraj Kulkarni 2020-9-15

Hi,

I'm in the process of taking a large table of data (419529x6, named 'TableData') and splitting it into smaller tables. I want to then write these tables to .csv (using writetable), however the code i've written which creates the tables stores them in a cell array (9x1). Please see below:

% Determines the total number of samples (rows)
Tot_Rows = height(TableData);
% Number of samples per table
N_Samples = 50000
% Create an array of samples per table over total number of samples
v = 1:N_Samples:Tot_Rows;
SplitTable = cell(numel(v) - 1,1);
for k = 2:numel(v)
    SplitTable{k-1} = TableData(v(k-1):v(k) - 1,:);
end
SplitTable{k} = TableData(v(end):end,:);

This then stores 9 tables (a split of TableData) into a 9x1 cell array named 'SplitTable'. I would now like for these individual tables to be written to .csv, all named something similar, perhaps:

SplitTableData_1.csv

SplitTableData_2.csv

SplitTableData_3.csv

...

SplitTableData_9.csv

I'm guessing a loop will be required for this to happen, however i'm still relatively new to MATLAB and am struggling to work a solution out.

I'm aware splitting data isn't ideal. This is for a specific piece of software which would benefit taking smaller datasets and merging them.

Any help/ suggested solutions will be greatly appreciated.

Thanks in advance!

CS.

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Answer 1

Neeraj Kulkarni 2020-9-15

1
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此回答的直接链接

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Hi Craig,

Yes, you can use a for loop to iterate over the cell array and write individual data into a .csv . You can you use writematrix() to write arrays present in each cell to the file.

Also, to iteratively create file names strings can be appended using append .

Below is a sample code snippet to give an example of how it can be done:

%strings for creating file name 
fName = 'SplitTableData';
ext = '.csv';
for x = 1:k  %k = 9  
    fNo = num2str(x);
    fName_final = append(fName,'_',fNo,ext);
    Data2Write = (SplitTable{x});
    writematrix(Data2Write,fName_final);
end