[new] added data file and a function that evaluates the Gutenberg-Richter relation for a given distance

pylot/core/analysis/magnitude.py

@@ -5,7 +5,7 @@ Created autumn/winter 2015.
 
 :author: Ludger Küperkoch / MAGS2 EP3 working group
 """
-
+import os
 import matplotlib.pyplot as plt
 import numpy as np
 from obspy.core import Stream, UTCDateTime
@@ -15,8 +15,14 @@ from scipy.optimize import curve_fit
 from scipy import integrate, signal
 from pylot.core.io.data import Data
 from pylot.core.util.dataprocessing import restitute_data, read_metadata
-from pylot.core.util.utils import common_range
+from pylot.core.util.utils import common_range, fit_curve
 
+def gutenberg_richter_relation(delta):
+    relation = np.loadtxt(os.path.join(os.path.expanduser('~'),
+                            '.pylot', 'gutenberg_richter.data'))
+    # prepare spline interpolation to calculate return value
+    func, params = fit_curve(relation[:,0], relation[:, 1])
+    return func(delta, params)
 
 class Magnitude(object):
     '''