Add lists->tbfs/state.

scribblings/tbn.scrbl

@@ -144,3 +144,14 @@ line (the threshold column) is discarded.
 @ex[
 (lists+headers->tbfs/state '((x y f) (1 2 3) (1 1 2)))
 ]}
+
+@defproc[(lists->tbfs/state [lsts (Listof (Liostf Real))])
+			    (Listof TBF/State)]{
+
+Like @racket[lists+vars->tbfs/state], but the names of the variables
+are generated as @tt{xi}, where @italic{i} is the index of the
+variable, starting from 0.
+
+@ex[
+(lists->tbfs/state '((1 2 3) (1 1 2)))
+]}

tbn.rkt

@@ -25,7 +25,7 @@
    (struct-out tbf/state) TBF/State tbf/state-w tbf/state-θ make-tbf/state
    sbf/state? apply-tbf/state
 
-   lists+vars->tbfs/state lists+headers->tbfs/state
+   lists+vars->tbfs/state lists+headers->tbfs/state lists->tbfs/state
    )
 
   (: apply-tbf-to-state (-> TBF (State (U Zero One)) (U Zero One)))
@@ -105,6 +105,19 @@
       (check-equal? (lists+headers->tbfs/state '((x y f) (1 2 3) (1 1 2)))
                     (list (tbf/state '#hash((x . 1) (y . 2)) 3)
                           (tbf/state '#hash((x . 1) (y . 1)) 2)))))
+
+  (: lists->tbfs/state (-> (Listof (Listof Real)) (Listof TBF/State)))
+  (define (lists->tbfs/state lsts)
+    (lists+vars->tbfs/state
+     (for/list ([i (in-range (length (car lsts)))])
+       (string->symbol (format "x~a" i)))
+     lsts))
+
+  (module+ test
+    (test-case "lists->tbfs/state"
+      (check-equal? (lists->tbfs/state '((1 2 3) (1 1 2)))
+                    (list (tbf/state '#hash((x0 . 1) (x1 . 2)) 3)
+                          (tbf/state '#hash((x0 . 1) (x1 . 1)) 2)))))
   )
 
 (module+ test