bugfix for issue StingraySoftware#851

Author: kashish2210

stingray/simulator/transfer.py

@@ -252,8 +252,9 @@ def simple_ir(dt=0.125, start=0, width=1000, intensity=1):
     # Fill in 0 entries until the start time
     h_zeros = np.zeros(int(start / dt))
 
-    # Define constant impulse response
-    h_ones = np.ones(int(width / dt)) * intensity
+    # Define constant impulse response (Fixed the bug)
+    num_ones = max(int(np.round(width / dt)), 1)  # Ensure at least one bin
+    h_ones = np.ones(num_ones) * intensity
 
     return np.append(h_zeros, h_ones)