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# distutils: language = c++
from libcpp.vector cimport vector
cdef class Matrix:
cdef unsigned ncols
cdef vector[float] v
def __cinit__(self, unsigned ncols):
self.ncols = ncols
def add_row(self):
"""Adds a row, initially zero-filled."""
self.v.resize(self.v.size() + self.ncols)
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