MATLAB: Fopen does not work for filename given by fullfile

Question

Hi

I tried to read input data from a file as follows. However it returns an error such that; "Error using fopen First input must be a file name of type char, or a file identifier of type double."

 main_data_path ='/usr/local/MATLAB/......';
folder = fullfile(main_data_path, 'row_data',...
                                        {'data1.dat';...
                                           'data2.dat';...
                                           'data3.dat';...
                                           'data3.dat';});
disp(folder);
data1 =  folder(1,1);
fileID = fopen(data1);

Can anyone please let me know what is wrong in this code?

Thanks you so much in advance! Best,

Answer 1

Try

fileID = fopen(data1{1})

Instead of

fileID = fopen(data1);

fopen needs a filepath as a character, your data1 is a cell.