CSV spreadsheet files are suitable for storing tabular data in a relatively portable way.

The CSV format is flexible but somewhat ill-defined.

For present purposes, authors may assume that the data fields contain no commas, backslashes, or quotation marks.



Task

Read a CSV file, change some values and save the changes back to a file.

For this task we will use the following CSV file:

C1,C2,C3,C4,C5
1,5,9,13,17
2,6,10,14,18
3,7,11,15,19
4,8,12,16,20

Suggestions


 Show how to add a column, headed 'SUM', of the sums of the rows.
 If possible, illustrate the use of built-in or standard functions, methods, or libraries, that handle generic CSV files.



filename='data.csv';
fid = fopen(filename);
header = fgetl(fid);
fclose(fid); 
X = dlmread(filename,',',1,0);
 
fid = fopen('data.out.csv','w+');
fprintf(fid,'%s,sum\n',header);
for k=1:size(X,1),
	fprintf(fid,"%i,",X(k,:));
	fprintf(fid,"%i\n",sum(X(k,:)));
end;
fclose(fid);