Folder = 'C:\Your\Data\Folder';
FileList = dir(fullfile(Folder, '*.nc'));
for iFile = 1:numel(FileList)
merra = fullfile(FileList(iFile).folder, FileList(iFile).name);
... your code comes here
end
Do not reset qv to the empty matrix, but pre-allocate the output and use 2 indices:
Folder = 'C:\Your\Data\Folder';
FileList = dir(fullfile(Folder, '*.nc'));
qv = zeros(21, numel(FileList));
for iFile = 1:numel(FileList)
...
for i = ...
qv(i, iFile) = ncread(merra, 'QV', [130, 38, i, 1], [1, 1, 1, 1]);
end
end
This is tricky:
for i = 1:size(level)
size() replies a vector. Then 1:size(level) uses the 1st element of the size vector and ignores the rest. If this is really wanted, prefer to do this explicitly:
for i = 1:size(level, 1)
If you mean the number of elements, use
for i = 1:numel(level)
