numpy - I get neither output, nor an error using np.linalg.pinv -

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i have tried , worked fine: 

phi = np.zeros((len(traindata),3)) phi[:,0] = 1 phi[:,1] = traindata[:,0]  phi[:,2] = traindata[:,1]   wml = np.dot(np.dot((np.linalg.pinv(np.dot((phi.t),phi))),(phi.t)), y_train) print wml, "weight selection"   [[ -1.08778441e+01] [ -3.61672723e-02] [ -4.38518378e-03]] weight selection

but when try same more columns following:

phi = np.zeros((len(traindata),5)) phi[:,0] = 1 phi[:,1] = traindata[:,0]  phi[:,2] = traindata[:,1]  phi[:,3] = traindata[:,2]  phi[:,4] = traindata[:,3]   wml = np.dot(np.dot((np.linalg.pinv(np.dot((phi.t),phi))),(phi.t)), y_train) print wml, "weight selection"

i did not obtain result or error. missing or doing wrong? have tried different datasets , different sizes , seems works fine until 3 columns 4 columns nothing shows up.

thank in advance!


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