How do I Import multiple data files?

Hi All

Hope you can help me with this! I am hopelessly struggling at trying to open 7 data files which have data arranged into rows rather than columns.

I also want to skip the first 4 lines in each txt file as they contain no data.

I have done the recommended steps- using the import data and creating a function.

then doing the following code in my main file:

numFiles = 7;
startRow = 5;
endRow = inf;
myData = cell(1,numFiles);

for fileNum = 1:numFiles
    fileName = sprintf('Record_%d.txt',fileNum);
    myData{fileNum} =importfile(filename, startRow, endRow)
end

Unfortunately I keep getting the error: unidentified variable 'filename' I am not sure where I am going wrong Do I need to name the function I am using somewhere?

Thanks