Path: blob/master/sage/modules/vector_integer_sparse_h.pxi
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#############################################################
#
# Sparse Vector over mpq_t (the GMP rationals)
#
#############################################################
include "../ext/cdefs.pxi"
cdef struct mpz_vector:
mpz_t *entries # array of nonzero entries
Py_ssize_t *positions # positions of those nonzero entries, starting at 0
Py_ssize_t degree # the degree of this sparse vector
Py_ssize_t num_nonzero # the number of nonzero entries of this vector.