/usr/lib/pd/extra/smlib/deltas-help.pd is in pd-smlib 0.12.2-2.
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 | #N canvas 1 53 489 293 10;
#X text 390 239 j#|@2002;
#X obj 412 217 SMLib-help;
#X floatatom 14 74 5 0 0 0 - - -;
#X obj 12 165 print deltas;
#X floatatom 68 108 5 0 0 0 - - -;
#X floatatom 120 107 5 0 0 0 - - -;
#X obj 24 104 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X obj 12 138 deltas 1 10 10;
#X obj 14 54 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X text 9 4 deltas: generates vector with differences between last
input and past inputs;
#X text 9 186 x(i)-x(i-a);
#X text 9 200 x(i)-x(i-(a+1));
#X text 9 214 x(i)-x(i-(a+2));
#X text 9 240 x(i)-x(i-(b));
#X text 7 225 ...;
#X text 153 137 [deltas a b c];
#X text 120 86 b;
#X text 66 87 a;
#X text 152 183 requires a<b and b<=c;
#X text 152 167 c = buffer size;
#X text 35 50 x(i);
#X msg 79 57 clear;
#N canvas 101 197 494 344 META 0;
#X text 12 175 HELP_PATCH_AUTHORS "pd meta" information added by Jonathan
Wilkes for Pd version 0.42.;
#X text 12 25 LICENSE GPL v2;
#X text 12 155 AUTHOR Johannes Taelman (johannes.taelman@rug.ac.be)
;
#X text 12 75 INLET_0 float factor clear;
#X text 12 45 DESCRIPTION generate vector with differences between
last input and past inputs;
#X text 12 115 INLET_2 float;
#X text 12 95 INLET_1 float;
#X text 12 135 OUTLET_0 list;
#X text 12 5 KEYWORDS control list_op;
#X restore 419 263 pd META;
#X connect 2 0 6 0;
#X connect 2 0 7 0;
#X connect 4 0 7 1;
#X connect 5 0 7 2;
#X connect 6 0 7 0;
#X connect 7 0 3 0;
#X connect 8 0 2 0;
#X connect 21 0 7 0;
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