example: Start explaining tbf/state and TBN.

example/example.org

@@ -876,6 +876,65 @@ tab
    (list (tbf '#(1 -1) 0) (tbf '#(2 2) 0))
    :END:
 
+** Threshold Boolean networks (TBN) <<tbn>>
+ =dds= includes a number of useful definitions for working with
+   threshold Boolean networks: networks of threshold Boolean
+   functions.  Since, standalone TBF do give names to their inputs,
+ =dds= also defines TBF operating on states:
+
+   #+BEGIN_SRC racket :results output drawer
+(make-tbf/state '((a . 1) (b . 1)) 1)
+   #+END_SRC
+
+   #+RESULTS:
+   :results:
+   (tbf/state '#hash((a . 1) (b . 1)) 1)
+   :end:
+
+   As the example standalone TBF, this TBF only returns 1 when both
+   inputs are activated:
+   #+BEGIN_SRC racket :results output drawer
+(apply-tbf/state (make-tbf/state '((a . 1) (b . 1)) 1)
+                 (make-state '((a . 1) (b . 1))))
+   #+END_SRC
+
+   #+RESULTS:
+   :results:
+   1
+   :end:
+
+   Here's how you can read this TBF from an Org-mode table:
+   #+NAME: simple-tbf/state
+   | a | b | f |
+   | 1 | 1 | 1 |
+
+   #+BEGIN_SRC racket :results output drawer :var simple-tbf/state=munch-sexp(simple-tbf/state)
+(read-org-tbfs/state simple-tbf/state)
+   #+END_SRC
+
+   #+RESULTS:
+   :results:
+   (list (tbf/state '#hash((a . 1) (b . 1)) 1))
+   :end:
+
+   Note that the header of the rightmost column is discarded.
+
+ =read-org-tbfs/state= can also read multiple TBFs at once:
+
+   #+NAME: simple-tbfs/state
+   |  a | b | f |
+   |  1 | 1 | 1 |
+   | -2 | 1 | 0 |
+
+   #+BEGIN_SRC racket :results output drawer :var simple-tbfs/state=munch-sexp(simple-tbfs/state)
+(read-org-tbfs/state simple-tbfs/state)
+   #+END_SRC
+
+   #+RESULTS:
+   :results:
+   (list (tbf/state '#hash((a . 1) (b . 1)) 1) (tbf/state '#hash((a . -2) (b . 1)) 0))
+   :end:
+
 * Reaction systems
   :PROPERTIES:
   :header-args:racket: :prologue "#lang racket\n(require graph dds/rs dds/utils)"