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How do you pull select columns from dozens of .csv files in a directory and make one long vector with all the values?
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How do you pull select columns from dozens of .csv file in a directory and make one long vector with all the values?
Each .csv file has the required data in the same location.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/373106/image.png)
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Jon
el 6 de Oct. de 2020
Editada: Jon
el 6 de Oct. de 2020
% I'll assume that your files are named follwing some meaningful pattern, e.g. data01.csv, data02.csv, ...You can adapt using your naming convention. You can do something like this:
% define some parameters
numFiles = 3; % just making up an example
baseName = 'data' % modify this according to your naming convention
% preallocate array to hold data
botData = zeros(4,numFiles);
topData = zeros(4,numFiles);
% loop through data
for k = 1:numFiles
% generate the current file name
% e.g. data02, data13,...
filename = [baseName,num2str(k,'%02d'),'.csv']; % modify this according to your naming convention
% read the selected data and save it an array with a column for each
% file
% note row and column ranges are zero referenced cell a1 is 0,0
botData(:,k) = csvread(filename,1,2,[1,2,4,2]);
topData(:,k) = csvread(filename,6,2,[6,2,9,2]);
end
% make single vector of data for bottom and top data
botData = botData(:); % reshapes columwise, could also use reshape(4*numFiles,1)
topData = topData(:);
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Jon
el 26 de Oct. de 2020
Sorry I have been away from the computer for awhile. If you haven't solved this yet I suggest that I think you will need to do the reads in two passes:
botData(1:4,k) = xlsread(filename,1,'C16:C19');
botData(5:8,k) = xlsread(filename,1,'G16:G19');
and similar for the top data.
By rather than using screen shots of your code, you can use the code button on the MATLAB answers menu bar and copy and paste your code in. That way other people can easily copy it back out.
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