/usr/lib/pd/extra/maxlib/delta-help.pd is in pd-maxlib 1.5.5-1.
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 | #N canvas 0 26 466 337 12;
#X floatatom 54 217 5 0 0 0 - - -;
#X floatatom 54 108 5 0 0 0 - - -;
#X msg 23 83 bang;
#X text 69 82 calculate and output result now;
#X obj 54 172 delta;
#X obj 54 133 * 3;
#X floatatom 127 218 5 0 0 0 - - -;
#X floatatom 127 109 5 0 0 0 - - -;
#X obj 127 134 * 3;
#X obj 127 173 delta 2;
#X text 53 242 use creation arguments to set order (1st or 2nd);
#X text 39 20 delta :: calculate 1st or 2nd order difference;
#N canvas 293 158 494 344 META 0;
#X text 12 126 HELP_PATCH_AUTHORS "pd meta" information added by Jonathan
Wilkes for Pd version 0.42.;
#X text 12 25 LICENSE GPL v2;
#X text 12 106 AUTHOR Olaf Matthes <olaf.matthes@gmx.de>;
#X text 12 45 DESCRIPTION calculate 1st or 2nd order difference;
#X text 12 66 INLET_0 bang float;
#X text 12 86 OUTLET_0 float;
#X text 12 5 KEYWORDS control;
#X restore 405 303 pd META;
#X connect 1 0 5 0;
#X connect 2 0 4 0;
#X connect 4 0 0 0;
#X connect 5 0 4 0;
#X connect 7 0 8 0;
#X connect 8 0 9 0;
#X connect 9 0 6 0;
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