Import certain column from files in directory and save in multiple columns

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Kundan 2013-9-3

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https://ww2.mathworks.cn/matlabcentral/answers/86261-import-certain-column-from-files-in-directory-and-save-in-multiple-columns

I am new to Matlab. I am trying to import multiple files from directory and import a specific column. The final output should be multiple columns. For e.g. I have file1.csv, file2.csv, file3.csv, etc. I need to read column 1 of each files and save it in final.csv which will have first column of each file

column 1 = 1st column of file1
column 2 = 1st column of file2
column 3 = 1st column of file3

so on and so forth..

Here's my code so far..I am struggling. Any help or direction is greatly appreciated. Thanks!

%%Read the files in the directory
dirData = dir('*.csv');
datFiles = {dirData.name};
nFiles = numel(datFiles);
fileName = char(datFiles);
for k = 1:nFiles;
delimiterIn = ' ';
headerlinesIn = 1;
newData1 = importdata(datFiles{k}, delimiterIn, headerlinesIn);
needed(:,k) = newData1.data(:,1);
end;

The error that I get is:

Attempt to reference field of non-structure array.

Edit: Changed curly bracket to small bracket in the second last line of the code and it works.

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Walter Roberson 2013-9-3

Which line does the problem occur on? Does the error happen on every file, or only one one particular file? What is class(newData1) when the problem occurs?

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