Good day guys, I have wrote a code to read multiple files and plot a graph from the information in the files in a folder but I am getting errors whilst trying to read the code. I have attached the code below and the errors which I get.

D = dir('C:/Users/NSebopetse/Pictures/nakampe-optiplex-760/san_2018-11*');

N = length(D);

for i = 1 : N

if ~strcmp(D(i).name(1),'.')

fn = fullfile(D(i).folder,D(i).name);

fileID = fopen(D(i).name, 'rt');

C =textscan(fileID(i), '%q %q','Delimiter',':, ');

end

end

fclose(fileID);

xx=C{3};

yy=C{1};

x = xx(2:25556);

y = yy(2:25556);

X = str2num( cell2mat(x) );

Y = str2num( cell2mat(y) );

figure(5)

plot(X,Y);

ERROR MESSAGE:

Index exceeds the number of array elements (1).

Error in scanall (line 7)

C =textscan(fileID(i), '%q %q','Delimiter',':, ');

[Walter Roberson]

why are you indexing fileID ?

[Sydney Sebopetse]

I am still new on Matlab so my coding knowledge of it is still in the learning phase, is it incorrect to use fileID ?