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8.5 Compound Elementwise Multiplication and Assignment

void operator.*=(vector x, vector y)
x .*= y is equivalent to x = x .* y.

void operator.*=(row_vector x, row_vector y)
x .*= y is equivalent to x = x .* y.

void operator.*=(matrix x, matrix y)
x .*= y is equivalent to x = x .* y.