Is there a way to access the column data without having to type `table_name.VariableName (:,:)`? I need to find the delta time from the time stamp of the data. This is what I have done so far:

```
[u,v]=size(a);
b=cell2table(cell(u,1));

for i=1:u
   if i==1
       b(i,1)={'0'};
   else
       b(i,1)=(datenum(a.PCTimestamp_None_(i,1)) ...
           -datenum(a.PCTimestamp_None_(i-1,1)))+str2double(b{i-1,1});
   end
end

```

The problem, I am having is, the time stamp is always in column 1. So I am looking for a way to access data just by mentioning first column instead of variable name. 

Any help would be appreciated.