diff options
Diffstat (limited to 'pyspike/python_backend.py')
| -rw-r--r-- | pyspike/python_backend.py | 112 |
1 files changed, 93 insertions, 19 deletions
diff --git a/pyspike/python_backend.py b/pyspike/python_backend.py index 7f8ea8c..481daf9 100644 --- a/pyspike/python_backend.py +++ b/pyspike/python_backend.py @@ -248,52 +248,69 @@ def cumulative_sync_python(spikes1, spikes2): def coincidence_python(spikes1, spikes2): def get_tau(spikes1, spikes2, i, j): - return 0.5*min([spikes1[i]-spikes1[i-1], spikes1[i+1]-spikes1[i], - spikes2[j]-spikes2[j-1], spikes2[j+1]-spikes2[j]]) + m = 1E100 # some huge number + if i < len(spikes1)-2: + m = min(m, spikes1[i+1]-spikes1[i]) + if j < len(spikes2)-2: + m = min(m, spikes2[j+1]-spikes2[j]) + if i > 1: + m = min(m, spikes1[i]-spikes1[i-1]) + if j > 1: + m = min(m, spikes2[j]-spikes2[j-1]) + return 0.5*m N1 = len(spikes1) N2 = len(spikes2) i = 0 j = 0 n = 0 - st = np.zeros(N1 + N2 - 2) - c = np.zeros(N1 + N2 - 3) - c[0] = 0 - st[0] = 0 - while n < N1 + N2: + st = np.zeros(N1 + N2 - 2) # spike times + c = np.zeros(N1 + N2 - 2) # coincidences + mp = np.ones(N1 + N2 - 2) # multiplicity + while n < N1 + N2 - 2: if spikes1[i+1] < spikes2[j+1]: i += 1 n += 1 tau = get_tau(spikes1, spikes2, i, j) st[n] = spikes1[i] - if spikes1[i]-spikes2[j] > tau: - c[n] = 0 - else: + if j > 0 and spikes1[i]-spikes2[j] < tau: + # coincidence between the current spike and the previous spike + # both get marked with 1 c[n] = 1 + c[n-1] = 1 elif spikes1[i+1] > spikes2[j+1]: j += 1 n += 1 tau = get_tau(spikes1, spikes2, i, j) st[n] = spikes2[j] - if spikes2[j]-spikes1[i] > tau: - c[n] = 0 - else: + if i > 0 and spikes2[j]-spikes1[i] < tau: + # coincidence between the current spike and the previous spike + # both get marked with 1 c[n] = 1 + c[n-1] = 1 else: # spikes1[i+1] = spikes2[j+1] + # advance in both spike trains j += 1 i += 1 if i == N1-1 or j == N2-1: break n += 1 + # add only one event, but with coincidence 2 and multiplicity 2 st[n] = spikes1[i] - c[n] = 0 - n += 1 - st[n] = spikes1[i] - c[n] = 1 - c[0] = c[2] + c[n] = 2 + mp[n] = 2 + + st = st[:n+2] + c = c[:n+2] + mp = mp[:n+2] + st[0] = spikes1[0] st[-1] = spikes1[-1] + c[0] = c[1] + c[-1] = c[-2] + mp[0] = mp[1] + mp[-1] = mp[-2] - return st, c + return st, c, mp ############################################################ @@ -409,3 +426,60 @@ def add_piece_wise_lin_python(x1, y11, y12, x2, y21, y22): y2_new[index] = y12[-1]+y22[-1] # only use the data that was actually filled return x_new[:index+2], y1_new[:index+1], y2_new[:index+1] + + +############################################################ +# add_discrete_function_python +############################################################ +def add_discrete_function_python(x1, y1, mp1, x2, y2, mp2): + + x_new = np.empty(len(x1) + len(x2)) + y_new = np.empty_like(x_new) + mp_new = np.empty_like(x_new) + x_new[0] = x1[0] + index1 = 0 + index2 = 0 + index = 0 + while (index1+1 < len(y1)) and (index2+1 < len(y2)): + if x1[index1+1] < x2[index2+1]: + index1 += 1 + index += 1 + x_new[index] = x1[index1] + y_new[index] = y1[index1] + mp_new[index] = mp1[index1] + elif x1[index1+1] > x2[index2+1]: + index2 += 1 + index += 1 + x_new[index] = x2[index2] + y_new[index] = y2[index2] + mp_new[index] = mp2[index2] + else: # x1[index1+1] == x2[index2+1] + index1 += 1 + index2 += 1 + index += 1 + x_new[index] = x1[index1] + y_new[index] = y1[index1] + y2[index2] + mp_new[index] = mp1[index1] + mp2[index2] + # one array reached the end -> copy the contents of the other to the end + if index1+1 < len(y1): + x_new[index+1:index+1+len(x1)-index1-1] = x1[index1+1:] + y_new[index+1:index+1+len(x1)-index1-1] = y1[index1+1:] + mp_new[index+1:index+1+len(x1)-index1-1] = mp1[index1+1:] + index += len(x1)-index1-1 + elif index2+1 < len(y2): + x_new[index+1:index+1+len(x2)-index2-1] = x2[index2+1:] + y_new[index+1:index+1+len(x2)-index2-1] = y2[index2+1:] + mp_new[index+1:index+1+len(x2)-index2-1] = mp2[index2+1:] + index += len(x2)-index2-1 + # else: # both arrays reached the end simultaneously + # x_new[index+1] = x1[-1] + # y_new[index+1] = y1[-1] + y2[-1] + # mp_new[index+1] = mp1[-1] + mp2[-1] + + y_new[0] = y_new[1] + mp_new[0] = mp_new[1] + + # 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] + |