Concatenate string with table

I want to save a txt file containing a header (string format with various information) followed by the data in columns (table format). OBS: The column names does not have to appear.

Ex:

>> header

header = 

"BEGIN

START = 0.0

END
"
>> class(header)

ans = 

   'string'
   
>> tab_data

tab_data = 380004 x 7 table

Answer 1

[Matt J]

writematrix(header,'filename.txt');

writetable(tab_data,'filename.txt',WriteVariableNames=false,WriteMode='append');

[Wictor Oliveira]

Thanks so much!