Data Science & Statistics: Matrix arithmetic in R

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How do arithmetic operations happen when your objects are matrices? Matrix operations happen in element-wise manner. Scaling a matrix comprises multiplying, or dividing, an entire structure by a single number. Matrix-by-matrix arithmetic works in cell-by-cell manner.

Matrix multiplication as done in linear algebra happens only if you specifically call for it. Inner matrix multiplication happens when you use the %*% operator, and outer matrix multiplication - when you use %o% this one.

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