[adresses #195] task related new function introduced

pylot/core/pick/compare.py

@@ -1,8 +1,31 @@
 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 
+from obspy import read_events
+
+from pylot.core.read.io import picks_from_evt
 from pylot.core.util.pdf import ProbabilityDensityFunction
 from pylot.core.util.version import get_git_version as _getVersionString
 
 __version__ = _getVersionString()
 __author__ = 'sebastianw'
+
+
+def readData(fn):
+    """
+    Reads pick data from QuakeML files named FN and returns a dictionary
+    containing a ProbabilityDensityFunction object for each pick.
+    :param fn: name of the QuakeML file which contains the picks
+    :type fn: str
+    :return: a dictionary containing the picks represented as pdfs
+    """
+    pdf_picks = picks_from_evt(read_events(fn)[0])
+
+    for station, phases in pdf_picks.items():
+        for phase, values in phases.items():
+            phases[phase] = ProbabilityDensityFunction.fromPick(values['epp'],
+                                                                values['mpp'],
+                                                                values['lpp'],
+                                                                type='exp')
+
+    return pdf_picks