/usr/lib/puredata/extra/choice/choice-help.pd is in puredata-extra 0.46.7-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | #N canvas 16 5 609 600 12;
#X obj 8 195 choice;
#X msg 41 86 print;
#X msg 29 63 clear;
#X msg 8 34 add 1 0 0 \, add 0 1 0 \, add 0 0 1 \, add 1 1 1 \, add
1 1 0;
#X obj 77 171 pack 0 0 0;
#X floatatom 182 125 0 0 0 0 - - -;
#X floatatom 148 125 0 0 0 0 - - -;
#X floatatom 115 125 0 0 0 0 - - -;
#X obj 77 147 f;
#X msg 77 125 bang;
#X floatatom 8 216 0 0 0 0 - - -;
#X obj 71 196 choice 1;
#X floatatom 71 217 0 0 0 0 - - -;
#X obj 76 4 choice;
#X text 135 3 - search for a best match to an incoming list;
#X text 19 243 The choice object holds a list of vectors \, each having
up to ten elements. When sent a list of numbers \, it outputs the index
of the known vector that matches most closely. The quality of the match
is the dot product of the two vectors after normalizing them \, i.e.
\, the vector whose direction is closest to that of the input wins.
;
#X text 19 340 If given a nonzero creation argument \, choice tries
to avoid repetitious outputs by weighting less recently output vectors
preferentially.;
#X text 20 389 You can use this to choose interactively between a number
of behaviors depending on their attributes. For example \, you might
have stored a number of melodies \, of which some are syncopated \,
some chromatic \, some are more than 100 years old \, some are bugle
calls \, and some are Christmas carols. You could then ask to find
a syncopated bugle call (1 \, 0 \, 0 \, 1 \, 0) and you'll get the
thing most closely matching the request.;
#X text 19 514 You can use numbers other than 0 and 1 to indicate relative
strengths of the attributes \, or even use negative numbers to indicate
opposites \, either in the incoming lists or in the stored ones.;
#X text 320 572 updated for Pd version-0.30;
#X text 79 62 delete all stored vectors;
#X text 498 34 add vectors;
#X text 94 84 debugging printout;
#X text 69 104 tweak the numbers and hit "bang" to input a list;
#X text 151 197 creation argument to avoid repeated outout;
#X text 108 219 output is the index of best match \, counting from
zero;
#X connect 0 0 10 0;
#X connect 1 0 0 0;
#X connect 2 0 0 0;
#X connect 2 0 11 0;
#X connect 3 0 0 0;
#X connect 3 0 11 0;
#X connect 4 0 0 0;
#X connect 4 0 11 0;
#X connect 5 0 4 2;
#X connect 6 0 4 1;
#X connect 7 0 8 1;
#X connect 8 0 4 0;
#X connect 9 0 8 0;
#X connect 11 0 12 0;
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