[R] RC class composition

[Mohan.Radhakrishnan at cognizant.com]

Hi,

The last line should give me the value of 'amount'. Is the syntax wrong ?

Measurement <- setRefClass("Measurement",
              fields = list(subject = Subject,
                                 quantity = Quantity))

s <- Subject$new(id = 100)

u <- CompoundUnit$new(  micrograms = 100,
                                      cubicmeter = 1 )

q <- Quantity$new(amount = 100,
                             units = u )

m <- Measurement$new(subject = s,
                                  quantity = q)
print( m$quantity$amount )

Thanks,
Mohan
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