Initial data commit

2023-07-01 11:58:00 -04:00 · 2023-07-01 11:58:00 -04:00 · f23f22d71c
commit f23f22d71c
parent 72d218235f
199087 changed files with 3378941 additions and 0 deletions
--- a/Task/Entropy/Forth/entropy.fth
+++ b/Task/Entropy/Forth/entropy.fth
@ -0,0 +1,21 @@
+: flog2 ( f -- f ) fln 2e fln f/ ;
+
+create freq 256 cells allot
+
+: entropy ( str len -- f )
+  freq 256 cells erase
+  tuck
+  bounds do
+    i c@ cells freq +
+    1 swap +!
+  loop
+  0e
+  256 0 do
+    i cells freq + @ ?dup if
+      s>f dup s>f f/
+      fdup flog2 f* f-
+    then
+  loop
+  drop ;
+
+s" 1223334444" entropy f.     \ 1.84643934467102  ok