Read about groupsummary(): https://www.mathworks.com/help/matlab/ref/double.groupsummary.html, especially check the first example on the documentation page.
If you want to create two tables then try something like this
T = table({'male', 'female', 'female', 'male', 'male'}.', rand(5,1), ...
'VariableNames', {'gender', 'height'});
grps = findgroups(T.gender);
n = max(grps);
Ts = cell(1, n);
for i = 1:n
Ts{i} = T(grps==i, :);
end
