Data Science Desktop Survival Guide by Graham Williams
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Changing Datasets in Memory

20180721 Let's make a change to the weather dataset by simply changing a single cell, changing the value of MinTemp (the third variable) for the first observation to 5.

weather[1,3] <- 5

Notice the divergence of the two datasets. They still share a lot in common, and hence only one copy of that data, but where they diverge, they now use different memory locations.

ref(weather)
ref(ds)