What you think is wrong with the following script?

mw = ftp('ftpprd.ncep.noaa.gov');
details = dir(mw,[data_path 'enp.t*.grib2']);
tz=zeros(length(details));
for num=1:length(details)
    tz(num) = str2double(details(num).name(6:7));
end
tz=sort(tz,'descend');

I have used on the past but now is not working.

PS. I have access directly to the ftp: ftpprd.ncep.noaa.gov.

Thank you.

[Guillaume]

now is not working

Nor is my crystal ball today. What does is not working mean? Do you get an error message? If so, which one? Do you get a different output than you expected? If so, what do you get and what did you expect?