Check for folder's existence off FTP Server

Hello,

I'd like to extract the most recent files from this server: <ftp://n4ftl01u.ecs.nasa.gov/SAN/AMSA/AE_Land3.002/>

How do I check for a file's existence? Due to the large amt of files, dir(f) only returns so many values. I have also tried fopen, isdir, and exist. I don't believe these functions work with ftp. My code is below:

    for i = 2:6
    time = now - i; %check several days before today.
    datevector = datevec(time);

    %open ftp server and extract file
    f= ftp('n4ftl01u.ecs.nasa.gov:21');
    cd(f,['/SAN/AMSA/AE_Land3.002/']);
    x = fopen(['ftp://n4ftl01u.ecs.nasa.gov/SAN/AMSA/AE_Land3.002/' num2str(datevector(1), '%03d') '.' num2str(datevector(2), '%02d') '.' num2str(datevector(3), '%02d') '/']);

    if (x ~= -1)
        break
    end

    end

Answer 1

[Esther]

~isempty(dir(filename))

[Donna]

EWei, you da best!

Answer 2

[Donna]

It was just:

x = ~isempty(dir(f,[ num2str(datevector(1), '%03d') '.' num2str(datevector(2), '%02d') '.' num2str(datevector(3), '%02d')]));