What does '* *' mean in matlab?

For example:

D = dir(fullfile(logfilepath,'**','*.log'))

Answer 1

[Stephen23]

The double asterisk tells dir to recursively search the provided path, the documentation explains it with "and dir **/*.txt lists all files with a txt extension zero or more folders under the current folder. Characters next to a ** wildcard must be file separators." This feature was introduced in R2016b, so if you use an earlier version you will have to use an alternative, e.g. one of these:

https://www.mathworks.com/matlabcentral/fileexchange?q=recursive+dir