% read the csv file:
data = readmatrix('data.csv')
% write the data to .dat file using
% space as the delimiter (no commas):
writematrix(data,'data.dat','Delimiter',' ');
% check that the .dat file looks right:
fid = fopen('data.dat');
dat_data = fread(fid,'*char').';
fclose(fid);
disp(dat_data); % looks good
I assumed the .csv file contains just numbers. If that's not the case, then you'd have to use functions other than readmatrix() and writematrix().
