||'''Book'''|| Linear Algebra ||
 ||'''Author'''|| Gilbert Strang ||
 ||'''Edition'''||  ||

/* code_begins */

{{{
def diagonalize(X):
    if is_diag(X):
        a= X.eigenvectors_left()
        l=[]
        for i in a:
            l.append(list(i[1][0]))
        S=transpose(matrix(l))
        D=(S^(-1))*X*S
        return D
    else:
        print "not diag"   


A1=matrix([[1,1,1],[1,1,1],[1,1,1]])    
diagonalize(A1)
out:not diag
}}}

/* code_ends */

 * '''Solution by''': 
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   * <Your Name>, <Profession>, <Organization>