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from scipy import integrate
import numpy as np

data = np.loadtxt("data.txt"
rr      = data[:,  0]
sigZ = data[:,  1]

fr      = rr*np.abs(sigZ)
intgl = 2.0*np.pi*integrate.trapz(fr,  rr)
print "The integral is ", intgl

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6Â¥: Originally posted by ¹Õµã at 2016-06-04 20:53:50
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r=[38.19        38.520745        38.85149        39.182235        39.512981        39.843726        40.174471        40.505216        40.835961        41.166706        41.497451        41.828197        42.158942        42.489687        42.820432        43.151177        43.481922        43.812667        44.143413        44.474158
]

r =

  Columns 1 through 15

   38.1900   38.5207   38.8515   39.1822   39.5130   39.8437   40.1745   40.5052   40.8360   41.1667   41.4975   41.8282   42.1589   42.4897   42.8204

  Columns 16 through 20

   43.1512   43.4819   43.8127   44.1434   44.4742

z=[169.068823
149.155847
129.816022
115.859568
101.439384
85.497986
75.478163
77.166082
86.332299
104.642294
93.414629
57.866729
18.946838
-21.822963
-43.7857
-58.993042
-63.724287
-66.180258
-64.728137
-62.85555
];
y=r*abs(z);
s=trapz(r,y);
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