/usr/lib/pd/extra/mapping/fir-help.pd is in pd-mapping 0.2.1-2.
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 | #N canvas 2 53 630 490 10;
#X declare -lib iemmatrix;
#X obj 174 76 loadbang;
#X text 97 58 data;
#X obj 93 161 t f f;
#X msg 102 128 0;
#X msg 185 127 0.2 0.2 0.2 0.2 0.2;
#X msg 132 128 1;
#X msg 174 98 0.4 0.3 0.1 0.1 0.1;
#X obj 93 248 timeroll 10;
#X obj 345 247 timeroll 10;
#X obj 123 187 fir 5;
#X obj 77 10 vsl 15 128 0 1 0 0 empty empty empty 0 -8 0 8 -262144
-1 -1 0 1;
#X obj 116 423 pddp/pddplink http://www.dspguru.com/info/faqs/firfaq.htm
;
#X text 67 407 For more info on FIR:;
#X text 183 188 the argument is the number of co-efficients;
#X text 328 112 these are a list of co-efficients;
#N canvas 464 140 494 344 META 0;
#X text 12 145 HELP_PATCH_AUTHORS "pd meta" information added by Jonathan
Wilkes for Pd version 0.42.;
#X text 12 25 LICENSE GPL v2;
#X text 12 105 OUTLET_0 float;
#X text 12 125 AUTHOR Cyrille Henry and Hans-Christoph Steiner;
#X text 12 65 INLET_0 float;
#X text 12 5 KEYWORDS control abstraction filter;
#X text 12 45 DESCRIPTION;
#X text 12 85 INLET_1 list;
#X restore 573 459 pd META;
#X connect 0 0 6 0;
#X connect 2 0 7 0;
#X connect 2 1 9 0;
#X connect 3 0 2 0;
#X connect 4 0 9 1;
#X connect 5 0 2 0;
#X connect 6 0 9 1;
#X connect 9 0 8 0;
#X connect 10 0 2 0;
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