From 7989b2d337a0e5d2e0223d7fdec73833ff47c7bb Mon Sep 17 00:00:00 2001
From: Mario Mulansky <mario.mulansky@gmx.net>
Date: Tue, 3 Feb 2015 16:40:55 +0100
Subject: first version of psth profile

---
 examples/spike_sync.py           |  8 ++++++++
 pyspike/__init__.py              |  3 ++-
 pyspike/cython/python_backend.py |  1 -
 pyspike/psth.py                  | 27 +++++++++++++++++++++++++++
 4 files changed, 37 insertions(+), 2 deletions(-)
 create mode 100644 pyspike/psth.py

diff --git a/examples/spike_sync.py b/examples/spike_sync.py
index 7f9e762..9c5f75c 100644
--- a/examples/spike_sync.py
+++ b/examples/spike_sync.py
@@ -30,6 +30,8 @@ plt.legend(loc="center right")
 
 plt.figure()
 
+plt.subplot(211)
+
 f = spk.spike_sync_profile_multi(spike_trains)
 x, y = f.get_plottable_data()
 plt.plot(x, y, '-b', alpha=0.7, label="SPIKE-Sync profile")
@@ -37,6 +39,12 @@ plt.plot(x, y, '-b', alpha=0.7, label="SPIKE-Sync profile")
 x1, y1 = f.get_plottable_data(averaging_window_size=50)
 plt.plot(x1, y1, '-k', lw=2.5, label="averaged SPIKE-Sync profile")
 
+plt.subplot(212)
+
+f_psth = spk.psth(spike_trains, bin_size=5.0)
+x, y = f_psth.get_plottable_data()
+plt.plot(x, y, '-k', alpha=1.0, label="PSTH")
+
 
 print("Average:", f.avrg())
 
diff --git a/pyspike/__init__.py b/pyspike/__init__.py
index 945dd4e..4d3f9f6 100644
--- a/pyspike/__init__.py
+++ b/pyspike/__init__.py
@@ -4,7 +4,7 @@ Copyright 2014-2015, Mario Mulansky <mario.mulansky@gmx.net>
 Distributed under the BSD License
 """
 
-__all__ = ["isi_distance", "spike_distance", "spike_sync",
+__all__ = ["isi_distance", "spike_distance", "spike_sync", "psth",
            "spikes", "PieceWiseConstFunc", "PieceWiseLinFunc",
            "DiscreteFunc"]
 
@@ -18,6 +18,7 @@ from spike_distance import spike_profile, spike_distance, spike_profile_multi,\
     spike_distance_multi, spike_distance_matrix
 from spike_sync import spike_sync_profile, spike_sync,\
     spike_sync_profile_multi, spike_sync_multi, spike_sync_matrix
+from psth import psth
 
 from spikes import add_auxiliary_spikes, load_spike_trains_from_txt, \
     spike_train_from_string, merge_spike_trains, generate_poisson_spikes
diff --git a/pyspike/cython/python_backend.py b/pyspike/cython/python_backend.py
index 481daf9..4efefc5 100644
--- a/pyspike/cython/python_backend.py
+++ b/pyspike/cython/python_backend.py
@@ -482,4 +482,3 @@ def add_discrete_function_python(x1, y1, mp1, x2, y2, mp2):
     # the last value is again the end of the interval
     # only use the data that was actually filled
     return x_new[:index+1], y_new[:index+1], mp_new[:index+1]
-
diff --git a/pyspike/psth.py b/pyspike/psth.py
new file mode 100644
index 0000000..8516460
--- /dev/null
+++ b/pyspike/psth.py
@@ -0,0 +1,27 @@
+"""
+
+Module containing functions to compute the PSTH profile
+
+Copyright 2015, Mario Mulansky <mario.mulansky@gmx.net>
+
+Distributed under the BSD License
+"""
+
+import numpy as np
+from pyspike import PieceWiseConstFunc
+
+
+# Computes the Peristimulus time histogram of a set of spike trains
+def psth(spike_trains, bin_size):
+
+    bins = int((spike_trains[0][-1] - spike_trains[0][0]) / bin_size)
+
+    N = len(spike_trains)
+    combined_spike_train = spike_trains[0][1:-1]
+    for i in xrange(1, len(spike_trains)):
+        combined_spike_train = np.append(combined_spike_train,
+                                         spike_trains[i][1:-1])
+
+    vals, edges = np.histogram(combined_spike_train, bins, density=False)
+    bin_size = edges[1]-edges[0]
+    return PieceWiseConstFunc(edges, vals/(N*bin_size))
-- 
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