X-Git-Url: https://scm.cri.ensmp.fr/git/Faustine.git/blobdiff_plain/14e4f8cd6102d273c520c2d2e0168a5221a7daeb..7aa377f6b67020aa1dff235ebb100943375cac94:/interpretor/signal.ml

diff --git a/interpretor/signal.ml b/interpretor/signal.ml
index b8f0e68..ae312b0 100644
--- a/interpretor/signal.ml
+++ b/interpretor/signal.ml
@@ -141,10 +141,11 @@ class signal : int -> (time -> value_type) -> signal_type =
 		    
 	method prefix : signal_type -> signal_type =
 	    fun (s_init : signal_type) ->
+	      let () = self#add_memory 1 in
 	      let func : time -> value_type = 
 		fun t ->
 		  if t = 0 then s_init#at 0
-		  else if t > 0 then self#at t
+		  else if t > 0 then self#at (t - 1) 
 		  else raise (Signal_operation "prefix time < 0.") in
 	      new signal self#frequency func