path: The Learning Path
In mpia: Meaningful Purposive Interaction Analysis

path returns a vector of references pointing to the chronologically ordered Performance objects, the person of interest has completed.

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   path( x, ix=NULL )

   path( x, from=NULL, to=Sys.time() )

`x`	a `Person` object.
`ix`	optional: numeric vector with the index positions of the performances to be returned. Using this, `path` will reshuffle the performances in the desired order.
`from`	character string containing a valid start date with time in the format "%Y-%m-%d %H:%M:%S". All performances before the from timestamp will be ignored.
`to`	optional: character string containing a valid end date with time in the format "%Y-%m-%d %H:%M:%S". If `to` is missing, the current date and time will be used. All performances after the to timestamp will be ignored.