from cvxopt import matrix, spmatrix
+from math import sqrt
def append_col(A,b):
"""
Return the ``n``-by-``n`` identity matrix.
"""
return spmatrix(1,range(n),range(n))
+
+def norm(x):
+ """
+ Return the Euclidean norm of the given vector.
+ """
+ return sqrt(sum([z**2 for z in x]))