Ascii characters in each indexed part of data. How can i fix it?

[msbalen]

I am saving data in parts (indexed), and forming a unique array. But each indexed part that goes to file has some strange characters. I think it may be some extra information (dimension, precision, etc..). The problem is that i cant find a way out to save my data correctly. I attached a reduced example of my program and you just have to play and look the file to see these characters. Other thing is, when one part (indexed)of array is bigger then another, the small one is fulfill with zeros. Why? Thank you.

[altenbach]

Apparently, you don't want to write an array of strings, but a single string. Simply build the string up as e.g. in the attached figure instead of indexing into an array. (I am not sure if you want the "end of line" between elements).