clc;clear;
% Create an empty array to store the electron density data
ne_array = [];
% Loop through the files in the folder
folder_path = 'D:\ionPrf_prov1_2020_002'; % replace with the path to your folder
file_list = dir(fullfile(folder_path, '*.0001_nc')); % replace '.0001_nc' with the file extension of your data files
for i = 1:numel(file_list)
% Read the electron density data from the file
filepath = fullfile(folder_path, file_list(i).name);
fid = fopen(filepath, 'r');
while ~feof(fid)
line = fgetl(fid);
if startsWith(line, 'ELEC_dens') % look for the line starting with 'Ne'
ne_data = strsplit(line);
ne_data = str2double(ne_data(2:end)); % extract the Ne data as an array of doubles
ne_array = [ne_array; ne_data]; % add the Ne data to the array
end
end
fclose(fid);
end
% Save the electron density data to a text file
output_filename = 'ne_data.txt';
dlmwrite(output_filename, ne_array, 'delimiter', '\t', 'precision', '%.3e');
Dear Ahmed Abdelaziz
The code you provided seems mostly correct. However, there is one potential issue that could cause an error. In the line `ne_data = str2double(ne_data(2:end));`, the indexing operation `ne_data(2:end)` assumes that there is at least one value in `ne_data`. If the line starting with `'ELEC_dens'` is not found in a file, `ne_data` will be an empty cell array, and indexing it will result in an error.
To resolve this issue, you can add a condition to check if `ne_data` is not empty before performing the indexing operation. Here's the modified code:
###Matlab start
clc;
clear;
% Create an empty array to store the electron density data
ne_array = [];
% Loop through the files in the folder
folder_path = 'D:\ionPrf_prov1_2020_002'; % replace with the path to your folder
file_list = dir(fullfile(folder_path, '*.0001_nc')); % replace '.0001_nc' with the file extension of your data files
for i = 1:numel(file_list)
% Read the electron density data from the file
filepath = fullfile(folder_path, file_list(i).name);
fid = fopen(filepath, 'r');
while ~feof(fid)
line = fgetl(fid);
if startsWith(line, 'ELEC_dens') % look for the line starting with 'Ne'
ne_data = strsplit(line);
if numel(ne_data) > 1
ne_data = str2double(ne_data(2:end)); % extract the Ne data as an array of doubles
ne_array = [ne_array; ne_data]; % add the Ne data to the array
end
end
end
fclose(fid);
end
% Save the electron density data to a text file
output_filename = 'ne_data.txt';
dlmwrite(output_filename, ne_array, 'delimiter', '\t', 'precision', '%.3e');
##code ends
With this modification, the code will only perform the indexing operation and add the data to `ne_array` if `ne_data` has more than one element, ensuring that an empty line or a line without the desired data doesn't cause an error.
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