Data Science & Statistics: Matrix recycling in R

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We know that in R vectors recycle. But do matrices? Yes, absolutely. This lesson explains how.
In the context of matrices, if you specify dimensions that can’t be filled up by your matrix, R will recycle the vector so your matrix is complete. For example, if I passed the vector from 1 to 10 in the matrix function, and made it explicit that I want my matrix to contain 4 rows and 4 columns, R will recognise that my vector is too short for the matrix, and it will repeat it until all 16 value spots hold a value. As you see, in this particular case, R also issues a warning that 10 is not a multiple of the number of rows, but that isn’t usually consequential. The moral of the story here is: be aware that recycling will happen, if necessary, in some matrix operations.

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