Solved
simply use "augment(a,b)" instead of "augment([ a b])" to avoid the nested matrices.
The WRITEFILE command only has effect if you either evaluate it by placing an inline evaluation (=) after it or by assigning it a dummy variable. The latter usually avoids cluttering the sheet with unwanted displayed matrices.
Your file Zescyt2.txt is therefore never written as you have neither an evaluation nor an assignment.
The file Zescyt3.txt would be written as you have an evaluation, but WRITEFILE does not know how to handle nested matrices and therefore fails.
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