Read multiple csv and plot

I have several csv files in a folder. I want to plot some graphes with each file.

This is my original code. It works, but I have to change file path every time.

csv_file = fopen('C:\Users\testing.csv','rt');
 formatSpec = '%s%s%s%s%s%s%s%s%s%s%s';
C = textscan(csv_file, formatSpec, 'Delimiter', ';');
fclose(csv_file);

This the code that I manage to extract several files in a folder.

csv_dir = uigetdir(' ');
file_list = dir(fullfile(csv_dir, '*.csv'));
file_list_num = size(file_list);
file_list_names = {file_list.name};
csv_file = fopen('file_list','rt');
formatSpec = '%s%s%s%s%s%s%s%s%s%s%s';
C = textscan(csv_file, formatSpec, 'Delimiter', ';');
fclose(csv_file);

Error code:

Error using textscan
Invalid file identifier. Use fopen to generate a valid file identifier.

Error in Untitled2 
C = textscan(csv_file, formatSpec, 'Delimiter', ';');

Answer 1

[dpb]

formatSpec = '%s%s%s%s%s%s%s%s%s%s%s';
csv_dir = uigetdir(' ');
d=dir(fullfile(csv_dir, '*.csv'));
for i=1:numel(file_list)
  fid = fopen(fullfile(d(i).folder,d(i).name),'r');
  C = textscan(csv_file, formatSpec, 'Delimiter', ';');
  fid=fclose(fid);
  ...

DIR() returns a struct of directory info; have to dereference it...plus you have the text string 'file_list' in the argument, not the variable altho that alone wouldn't fix the problem.

See

doc dir

for full syntax, examples, etc., ...

[Ming-En Han]

Hello dpb

Thank you so much for you reply.

I really appreciate