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A fract_vector object can be constructed from an
integer_row (see section Row Manipulation) or another
fract_vector. A constructor is also available that takes the
number of elements and creates an empty fract_vector (the
elements are initialized to 0).
The n method returns the number of elements in the vector. The
elt method and [] operator take an element number as an
argument and return a reference to the fraction at that position in the
vector. The is_zero method returns TRUE if all elements
of the vector are 0. Also, equality, inequality and assignment
operators are available.
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