How to write 2D spectrum data in text file ?

hi dears, I have some data and i want these in .txt file , like this: ...

20090101.000000

Factor

1

2 3 4 5

6 7 8 9

First line is time,second line not change in time (constant) and then matrix(n*m),

And next line over again i must have this structure but time is 20090101.010000 and then "factor" and"1" and then matrix (n*m). I have time (matrix(n*1)) but in datenum format, and i have data matrix (in fourth line) but these data is on matrix (t*n*m) t is length of time ,in first hour use matrix(1,n,m) and so on

Now i want to write these data on text file,

I don't know how can i do that,

Any one help me please?