Question

How to save VISUM matrices in $O or $V format with a defined number of decimal places?
Where to set decimlal places shown in the matrix editor?

Resolution

The number of decimal places is a direct property of the net element matrix respectively a matrix attribute.
For example you may have a look at the quick view after chosen a matrix under tab Matrices. There you can edit the number of decimal places (also possible under Lists/Matrices). This number of decimal places only effects output in ASCII/text format, binary matrix files always hold the entire accuracy of the values.

Decimal places shown in the Matrix editor are set under View options... (2. symbol of menu bar).