SYNTAX            : ARG M REG

7.0:
RESULTING VALUE(S): Whatever ARGUMENT, RANGE or LIST was left by the last
                    command in the macro present in register REG. And, of
                    course, a command not leaving anything as return
                    value(s) causes M to return nothing as well.

FUNCTION          : Execute the (string) content of the register whose
                    name immediately follows the command a specified number
                    of times as a command-sequence.

ARGUMENT          : The number of times to execute the macro.

DEFAULT/MINIMUM   : 1 (before 7.0:0)

EXAMPLE           : 3 ma
                    Will interpret the content of register A as command
                    sequences and execute them three times.

7.0:
NOTE 1            : For non-positive values, see here.

7.0:
NOTE 2            : To access the register as an array, a subscript can be
                    used.

MATRIX