How to add data to an existing txt file which already contains some lines ?

How to add data to an existing txt file which already contains some lines ?

Answer 1

[Azzi Abdelmalek]

a=[1 2 3;4 5 6]
dlmwrite('file.txt',a,'-append','newline','pc')

[Marisabel Gonzalez]

How can you do it for a new column?

Answer 2

[Stephen23]

Read the fopen documentation and have a look at the permission options. You will find the permission 'a' or 'a+' of particular interest.

You can use fprintf to print text to file, or one of the other text-file writing functions.