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Question
the key aspect of matrix data is in contrast to a ***, where every column of a *** can potentially be of a different ***.
Answer
the key aspect of matrix data is in contrast to a data frame, where every column of a data frame can potentially be of a different class.

Question
the key aspect of matrix data is in contrast to a ***, where every column of a *** can potentially be of a different ***.
Answer
?

Question
the key aspect of matrix data is in contrast to a ***, where every column of a *** can potentially be of a different ***.
Answer
the key aspect of matrix data is in contrast to a data frame, where every column of a data frame can potentially be of a different class.
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pdf

owner: aelizzybeth - (no access) - Exploratory_Data_Analysis_with_R_Peng.pdf, p128

Summary

statusnot learnedmeasured difficulty37% [default]last interval [days]               
repetition number in this series0memorised on               scheduled repetition               
scheduled repetition interval               last repetition or drill

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