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import vec2
def det(m):
((m00,m01),(m10,m11))= m
return m00*m11 - m01*m10
def mul(a,b):
b_trans= zip(* b)
return tuple([transmulvec2(b_trans, a_r) for a_r in a])
# multiple vector v by a transposed matrix
def transmulvec2(m_trans,v):
return tuple([vec2.dot(v, m_c) for m_c in m_trans])
def mulvec2(m,v):
return transmulvec2(zip(* m), v)
def mulN(m,N):
return tuple([vec2.mulN(v,N) for v in m])
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