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Special Variables
The following variables are predefined:
last returns the value of the last expression calculated.
random returns a 'random' number uniformly distributed in the range 0 to 1.
See 'Random Numbers'.
today returns today’s date in units of hours. The view mode should be set
to Time and Date.
now returns the current time in units of hours. The view mode should be set to Time and Date. The
expression today+now yields the current date and time.
The value of pi (= 3.14159…) is also predefined, but it is of course a constant.