python - Create matrix from list of list of tuples using list comprehension -


i have list of lists of tuples list1

list1 = [[('a',0.01),('b',0.23),('c',1e-7)],       [('a',0.91),('b',0.067),('c',0.38)]]

and want create numpy matrix each row second value of tuple in list1. matrix, lets call a, have form

a = [[0.01,0.23,1e-7],[0.91,0.067,0.38]] a.shape >>> (2,3)

so far have managed achieve in slow , inefficient way

a = [] in range(len(list1)):     a.append(np.array([v k,v in list1[i]])) = np.array(a)

how can using list comprehension?

you need nested list comprehensions this:

np.array([[tup[1] tup in lst] lst in list1]) out:  array([[  1.00000000e-02,   2.30000000e-01,   1.00000000e-07],        [  9.10000000e-01,   6.70000000e-02,   3.80000000e-01]])

a better solution be:

np.array(list1)[:,:,1].astype('float') out:  array([[  1.00000000e-02,   2.30000000e-01,   1.00000000e-07],        [  9.10000000e-01,   6.70000000e-02,   3.80000000e-01]])

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