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Why are the results of cvxpy and cvxopt different?


What is the difference between @staticmethod and @classmethod?What is the difference between Python's list methods append and extend?Python join: why is it string.join(list) instead of list.join(string)?Difference between __str__ and __repr__?Why does comparing strings using either '==' or 'is' sometimes produce a different result?What are the differences between type() and isinstance()?Why can't Python parse this JSON data?Importing files from different folderWhy is reading lines from stdin much slower in C++ than Python?Why is “1000000000000000 in range(1000000000000001)” so fast in Python 3?






.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;








3















import numpy as np
import pandas as pd
import cvxpy as cp
import cvxopt
from cvxopt import matrix
G_ = np.load('/shared/FactorBank/temp/G.npy')
h_ = np.load('/shared/FactorBank/temp/h.npy')
q_ = np.load('/shared/FactorBank/temp/q.npy')
N = len(q_)


This is the part of cvxpy.



h = h_.reshape(len(h_))
A = np.ones((1, N))
b = np.ones(1)
x = cp.Variable(int(N))
obj = cp.sum(q_ * x)
#print(G_)
constraints = [G_ * x <= h, A * x == b]
prob = cp.Problem(cp.Minimize(obj), constraints)
prob.solve()
print "status:", prob.status
print "optimal value", prob.value
print "optimal var", x.value


status: optimal



optimal value -3.598688474475655



optimal var [ 1.45281688e-05 1.21958458e-05 -2.80709993e-04 ... -1.77801870e-04
-2.01577984e-04 -1.12303384e-04]



This is the part of cvxopt.



G = matrix(G_)
h = matrix(h_)
A = matrix(1.0, (1, N))
b = matrix(1.0)
q = matrix(q_.T)
portfolios = cvxopt.solvers.lp(q, G, h, A, b)


pcost dcost gap pres dres k/t



0: 2.8090e-02 -3.1698e+02 2e+04 2e-01 5e-09 1e+00



1: -6.1531e+01 -9.3943e+01 2e+03 2e-02 6e-10 2e-02



2: -2.7578e+01 -3.3144e+01 1e+02 3e-03 1e-10 2e-02



3: -1.8330e+01 -2.1642e+01 7e+01 2e-03 6e-11 1e-02



……



22: -2.4301e+00 -2.4301e+00 5e-06 1e-10 3e-11 7e-10



23: -2.4301e+00 -2.4301e+00 8e-08 2e-12 1e-09 1e-11
Optimal solution found.



So does anyone know although the status are both "optimal", why the results are not the same?










share|improve this question




























    3















    import numpy as np
    import pandas as pd
    import cvxpy as cp
    import cvxopt
    from cvxopt import matrix
    G_ = np.load('/shared/FactorBank/temp/G.npy')
    h_ = np.load('/shared/FactorBank/temp/h.npy')
    q_ = np.load('/shared/FactorBank/temp/q.npy')
    N = len(q_)


    This is the part of cvxpy.



    h = h_.reshape(len(h_))
    A = np.ones((1, N))
    b = np.ones(1)
    x = cp.Variable(int(N))
    obj = cp.sum(q_ * x)
    #print(G_)
    constraints = [G_ * x <= h, A * x == b]
    prob = cp.Problem(cp.Minimize(obj), constraints)
    prob.solve()
    print "status:", prob.status
    print "optimal value", prob.value
    print "optimal var", x.value


    status: optimal



    optimal value -3.598688474475655



    optimal var [ 1.45281688e-05 1.21958458e-05 -2.80709993e-04 ... -1.77801870e-04
    -2.01577984e-04 -1.12303384e-04]



    This is the part of cvxopt.



    G = matrix(G_)
    h = matrix(h_)
    A = matrix(1.0, (1, N))
    b = matrix(1.0)
    q = matrix(q_.T)
    portfolios = cvxopt.solvers.lp(q, G, h, A, b)


    pcost dcost gap pres dres k/t



    0: 2.8090e-02 -3.1698e+02 2e+04 2e-01 5e-09 1e+00



    1: -6.1531e+01 -9.3943e+01 2e+03 2e-02 6e-10 2e-02



    2: -2.7578e+01 -3.3144e+01 1e+02 3e-03 1e-10 2e-02



    3: -1.8330e+01 -2.1642e+01 7e+01 2e-03 6e-11 1e-02



    ……



    22: -2.4301e+00 -2.4301e+00 5e-06 1e-10 3e-11 7e-10



    23: -2.4301e+00 -2.4301e+00 8e-08 2e-12 1e-09 1e-11
    Optimal solution found.



    So does anyone know although the status are both "optimal", why the results are not the same?










    share|improve this question
























      3












      3








      3








      import numpy as np
      import pandas as pd
      import cvxpy as cp
      import cvxopt
      from cvxopt import matrix
      G_ = np.load('/shared/FactorBank/temp/G.npy')
      h_ = np.load('/shared/FactorBank/temp/h.npy')
      q_ = np.load('/shared/FactorBank/temp/q.npy')
      N = len(q_)


      This is the part of cvxpy.



      h = h_.reshape(len(h_))
      A = np.ones((1, N))
      b = np.ones(1)
      x = cp.Variable(int(N))
      obj = cp.sum(q_ * x)
      #print(G_)
      constraints = [G_ * x <= h, A * x == b]
      prob = cp.Problem(cp.Minimize(obj), constraints)
      prob.solve()
      print "status:", prob.status
      print "optimal value", prob.value
      print "optimal var", x.value


      status: optimal



      optimal value -3.598688474475655



      optimal var [ 1.45281688e-05 1.21958458e-05 -2.80709993e-04 ... -1.77801870e-04
      -2.01577984e-04 -1.12303384e-04]



      This is the part of cvxopt.



      G = matrix(G_)
      h = matrix(h_)
      A = matrix(1.0, (1, N))
      b = matrix(1.0)
      q = matrix(q_.T)
      portfolios = cvxopt.solvers.lp(q, G, h, A, b)


      pcost dcost gap pres dres k/t



      0: 2.8090e-02 -3.1698e+02 2e+04 2e-01 5e-09 1e+00



      1: -6.1531e+01 -9.3943e+01 2e+03 2e-02 6e-10 2e-02



      2: -2.7578e+01 -3.3144e+01 1e+02 3e-03 1e-10 2e-02



      3: -1.8330e+01 -2.1642e+01 7e+01 2e-03 6e-11 1e-02



      ……



      22: -2.4301e+00 -2.4301e+00 5e-06 1e-10 3e-11 7e-10



      23: -2.4301e+00 -2.4301e+00 8e-08 2e-12 1e-09 1e-11
      Optimal solution found.



      So does anyone know although the status are both "optimal", why the results are not the same?










      share|improve this question














      import numpy as np
      import pandas as pd
      import cvxpy as cp
      import cvxopt
      from cvxopt import matrix
      G_ = np.load('/shared/FactorBank/temp/G.npy')
      h_ = np.load('/shared/FactorBank/temp/h.npy')
      q_ = np.load('/shared/FactorBank/temp/q.npy')
      N = len(q_)


      This is the part of cvxpy.



      h = h_.reshape(len(h_))
      A = np.ones((1, N))
      b = np.ones(1)
      x = cp.Variable(int(N))
      obj = cp.sum(q_ * x)
      #print(G_)
      constraints = [G_ * x <= h, A * x == b]
      prob = cp.Problem(cp.Minimize(obj), constraints)
      prob.solve()
      print "status:", prob.status
      print "optimal value", prob.value
      print "optimal var", x.value


      status: optimal



      optimal value -3.598688474475655



      optimal var [ 1.45281688e-05 1.21958458e-05 -2.80709993e-04 ... -1.77801870e-04
      -2.01577984e-04 -1.12303384e-04]



      This is the part of cvxopt.



      G = matrix(G_)
      h = matrix(h_)
      A = matrix(1.0, (1, N))
      b = matrix(1.0)
      q = matrix(q_.T)
      portfolios = cvxopt.solvers.lp(q, G, h, A, b)


      pcost dcost gap pres dres k/t



      0: 2.8090e-02 -3.1698e+02 2e+04 2e-01 5e-09 1e+00



      1: -6.1531e+01 -9.3943e+01 2e+03 2e-02 6e-10 2e-02



      2: -2.7578e+01 -3.3144e+01 1e+02 3e-03 1e-10 2e-02



      3: -1.8330e+01 -2.1642e+01 7e+01 2e-03 6e-11 1e-02



      ……



      22: -2.4301e+00 -2.4301e+00 5e-06 1e-10 3e-11 7e-10



      23: -2.4301e+00 -2.4301e+00 8e-08 2e-12 1e-09 1e-11
      Optimal solution found.



      So does anyone know although the status are both "optimal", why the results are not the same?







      python






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Mar 26 at 9:08









      ArianaAriana

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