How to put sequence number in the table form?

Hi, I am new in matlab and have a problem in putting sequence number on the table. Could you please help me? so here is my code:

x=height(myfile)    %to know the number of rows in the table
myfile{:,16}=[1:x]  %to fill down column 16 with sequence number until the last row

However, it did not work well :( Thank you very much for your help.

Answer 1

[Walter Roberson]

myfile{:,16} = (1:x).';

[Kasih Ditaningtyas Sari Pratiwi]

Cool. Thanks Walter! :D