I use macOS=10.6 and Numbers=6.2.
I have a CSV-file and open this with Numbers. All the data are there. I create a Diagram using 2 columns from the sheet. The diagram appears, but there are no values.
I have found out that the reason is that the values have ‘dot’ as decimal point and I use ‘comma’. If I overwrite a value with comma, it appears in the diagram. However, the sheet has several hundred lines, so I need a simple way to change decimal point in all lines. I have tried copy format, but this doesn’t work.