@Mac Dude 

hi ! thank you for your answer....  but still get problems...   :-(

if im using your second command -->  

ExportMatrix("Filename.txt",Matrix,delimited, delimiter=" ");

then i got a failure message:

my command --> 

error message -->

Error, invalid input: ExportMatrix expects its 2nd argument, M, to be of type Matrix, but received Matrix

and what about noninteger x-values like 1.1, 1.2 a.s.o   ??

can you help again ?

greetings   kreso :-)