python - Selecting elements from a .dat file according to an assigned value -

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i have .dat file of form:

   1.5699000000000001       -10.230000000000000                3    1.5978000000000001       -10.550000000000001                3    1.2388999999999999       -9.7100000000000009                3    1.9540999999999999       -12.910000000000000                4    1.7915000000000001       -12.539999999999999                4    1.7547999999999999       -10.740000000000000                4    1.8927000000000000       -10.800000000000001                4    1.9222999999999999       -10.869999999999999                4    1.9047000000000001       -11.770000000000000                4    1.8488000000000000       -12.279999999999999                4    1.6536000000000000       -10.690000000000000                3    1.7059000000000000       -11.410000000000000                4    1.7834000000000001       -12.250000000000000                4    1.4136000000000000       -9.7699999999999996                3    1.8093999999999999       -10.990000000000000                4    1.4621999999999999       -10.490000000000000                4    1.4086000000000001       -10.670000000000000                3    1.5290999999999999       -10.660000000000000                3    1.5990000000000000       -10.619999999999999                3    1.9164000000000001       -12.580000000000000                4    1.9463999999999999       -12.580000000000000                4    1.6439999999999999       -12.340000000000000                4    1.8986000000000001       -12.270000000000000                4    1.4316000000000000       -10.029999999999999                4    1.8346000000000000       -11.000000000000000                4    1.3900999999999999       -10.650000000000000                3

firstly, wondering how set numpy array, perhaps utilise fromfile numpy module.

secondly, how separate further 2 arrays, 1 elements containing '3' , 1 '4'...?

plz use genfromtxt():

in [8]:  import numpy np  = np.genfromtxt('your_file.dat')  in [9]:  print a[a[:,2]==3]  [[  1.5699 -10.23     3.    ]  [  1.5978 -10.55     3.    ]  [  1.2389  -9.71     3.    ]  [  1.6536 -10.69     3.    ]  [  1.4136  -9.77     3.    ]  [  1.4086 -10.67     3.    ]  [  1.5291 -10.66     3.    ]  [  1.599  -10.62     3.    ]  [  1.3901 -10.65     3.    ]]  in [10]:  print a[a[:,2]==4]  [[  1.9541 -12.91     4.    ]  [  1.7915 -12.54     4.    ]  [  1.7548 -10.74     4.    ]  [  1.8927 -10.8      4.    ]  [  1.9223 -10.87     4.    ]  [  1.9047 -11.77     4.    ]  [  1.8488 -12.28     4.    ]  [  1.7059 -11.41     4.    ]  [  1.7834 -12.25     4.    ]  [  1.8094 -10.99     4.    ]  [  1.4622 -10.49     4.    ]  [  1.9164 -12.58     4.    ]  [  1.9464 -12.58     4.    ]  [  1.644  -12.34     4.    ]  [  1.8986 -12.27     4.    ]  [  1.4316 -10.03     4.    ]  [  1.8346 -11.       4.    ]]

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