MATLAB: If elseif else in Table

Question

I have a column in my table containing numerical data, where I want to make them into 4 specific groups in a new column in the same table. I do not know how to write the code, but have attempted the following failed codes. Please correct me.

num_rows = size(Table1.Time,1)     %count the number of rows in Table 1
for i=1:1:num_rows
if T1.Time < 5                     
   T1.TimeNew = 5;                 % Group 1, return in a new column in Table 1
elseif T1.Time >= 5 & T1.Time <15
       T1.TimeNew = 15;            % Group 2
elseif T1.Time >= 15 & T1.Time <25
       T1.TimeNew = 25;            % Group 3
else T1.TimeNew = 30;              % Group 4 (for any data >=25)
end
end

Answer 1

ii = discretize(T.Time,[-inf,5,15,25,inf])
V = [5,15,25,30]';
T.TimeNew = V(ii);