For Loop calculating too slowly

The code I am running now takes way too long to go through all the iterations to calculate the direction cosine matrix (DCM) for each second, minute, hour. I am using the function 'dcmeci2ecef' in the aerospace toolbox to calculate a DCM that I need to continue. I know there should be better ways to write this that does not take a long time to go through each iteration and display each individual DCM through the course of 24 hours. Any ideas?

for i = 0:24             % hours 
    for j = 0:60       % minutes in a hour
        for k = 0:60  % seconds in a min
             dcm_FI = dcmeci2ecef('IAU-2000/2006',[2019 9 30 i j k]);
        end
    end
end

Answer 1

[darova]

Maybe try

[S,M,H] = ndgrid(0:60, 0:60, 0:24);
data1 = repmat([2019 9 30],[length(S(:)) 1]);
data2 = [H(:) M(:) S(:)];
data = [data1 data2];
dcm_FI = dcmeci2ecef('IAU-2000/2006', data)

[Guillaume]

Note that length(S(:)) is simply numel(S).

A simpler way to create that data matrix would be:

data = datevec(datetime(2019, 9, 30) + seconds(0:60*60*24-1)')