/usr/lib/pd/extra/list-abs/list-centroid.pd is in pd-list-abs 0.1-1.
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 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 | #N canvas 204 70 675 629 10;
#X obj 127 475 f;
#X obj 127 65 inlet;
#X obj 127 561 outlet;
#X obj 163 170 list-enumerate;
#X obj 163 197 t a a;
#X obj 261 406 /;
#X obj 261 376 swap;
#X obj 210 345 select 0;
#N canvas 286 344 401 287 sum(mi*i) 0;
#X obj 126 138 +;
#X obj 153 139 f;
#X msg 168 88 0;
#X obj 126 66 inlet;
#X obj 168 66 inlet;
#X obj 126 171 outlet;
#X obj 126 103 *;
#X connect 0 0 1 0;
#X connect 0 0 5 0;
#X connect 1 0 0 1;
#X connect 2 0 0 1;
#X connect 3 0 6 0;
#X connect 4 0 2 0;
#X connect 6 0 0 0;
#X restore 284 255 pd sum(mi*i);
#N canvas 573 330 450 328 sum(mi) 0;
#X obj 179 137 +;
#X obj 206 138 f;
#X msg 296 77 0;
#X obj 179 55 inlet;
#X obj 296 55 inlet;
#X obj 179 170 outlet;
#X text 143 34 in: (idx value);
#X text 40 89 swap to: (val idx);
#X text 67 172 sum of values;
#X obj 179 89 swap;
#X connect 0 0 1 0;
#X connect 0 0 5 0;
#X connect 1 0 0 1;
#X connect 2 0 0 1;
#X connect 3 0 9 0;
#X connect 4 0 2 0;
#X connect 9 0 0 0;
#X restore 163 253 pd sum(mi);
#X obj 210 559 outlet;
#X obj 127 399 spigot 1;
#X obj 145 285 f;
#X obj 240 528 print list-centroid;
#X obj 210 468 t b b;
#X msg 240 503 warning: sum of items equals 0: centroid is undefined!
;
#X obj 127 89 t b b a b b;
#X text 69 26 centroid (center of mass) = sum(mi * i) / sum(mi);
#X connect 0 0 2 0;
#X connect 1 0 16 0;
#X connect 3 0 4 0;
#X connect 4 0 9 0;
#X connect 4 1 8 0;
#X connect 5 0 0 1;
#X connect 6 0 5 0;
#X connect 6 1 5 1;
#X connect 7 0 14 0;
#X connect 7 1 6 0;
#X connect 8 0 6 1;
#X connect 9 0 12 1;
#X connect 11 0 0 0;
#X connect 12 0 7 0;
#X connect 12 0 11 1;
#X connect 14 0 10 0;
#X connect 14 1 15 0;
#X connect 15 0 13 0;
#X connect 16 0 11 0;
#X connect 16 1 12 0;
#X connect 16 2 3 0;
#X connect 16 3 9 1;
#X connect 16 4 8 1;
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