get_number_of_tracking_periods

Get the number of tracking periods already added to the P2Tracking object.

A tracking period can be added using the P2Tracking:add_tracking_period function. The tracking period ID starts at zero.

Parameters:

I/O	Type	Name	Description
output	integer	periods	number of periods

Example:

function ()
io.write('\n')
end

Class:

P2Tracking