The decimalsign command selects a decimal sign for numbers printed into tic labels or label strings.
Syntax:
set decimalsign {<value>} unset decimalsign show decimalsign
The argument <value> is the string to be used in place of the usual decimal point. Typical choices include the period, '.', and the comma, ',', but others may be useful, too. If you omit the <value> argument, the decimal separator is not modified from the usual default, which is a period. Unsetting decimalsign has the same effect as omitting <value>.
Example:
Correct typesetting in most European countries requires:
set decimalsign ','