/usr/lib/pd/extra/smlib/prevl-help.pd is in pd-smlib 0.12.2-1.
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 | #N canvas 1 53 489 300 10;
#X text 364 181 j#|@2002;
#X obj 386 159 SMLib-help;
#X floatatom -12 16 5 0 0 0 - - -;
#X floatatom 42 50 5 0 0 0 - - -;
#X floatatom 94 49 5 0 0 0 - - -;
#X obj -2 46 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X obj -12 -4 bng 15 250 50 0 empty empty empty 0 -6 0 8 -262144 -1
-1;
#X text -19 167 ...;
#X text 127 79 [deltas a b c];
#X text 94 28 b;
#X text 40 29 a;
#X text 126 125 requires a<b and b<=c;
#X text 126 109 c = buffer size;
#X text 9 -8 x(i);
#X obj -14 107 print prevl;
#X text -17 -54 prevl: generates vector with past input values (float)
;
#X text -17 128 x(i-a);
#X text -17 142 x(i-(a+1));
#X text -17 156 x(i-(a+2));
#X text -17 182 x(i-(b));
#X obj -14 80 prevl 0 10 10;
#X msg 71 2 clear;
#N canvas 131 167 494 344 META 0;
#X text 12 165 HELP_PATCH_AUTHORS "pd meta" information added by Jonathan
Wilkes for Pd version 0.42.;
#X text 12 25 LICENSE GPL v2;
#X text 12 145 AUTHOR Johannes Taelman (johannes.taelman@rug.ac.be)
;
#X text 12 5 KEYWORDS control;
#X text 12 45 DESCRIPTION generate vector with past input values (float)
;
#X text 12 65 INLET_0 float bang clear;
#X text 12 85 INLET_1 float;
#X text 12 105 INLET_2 float;
#X text 12 125 OUTLET_0 list;
#X restore 395 212 pd META;
#X connect 2 0 20 0;
#X connect 2 0 5 0;
#X connect 3 0 20 1;
#X connect 4 0 20 2;
#X connect 5 0 20 0;
#X connect 6 0 2 0;
#X connect 20 0 14 0;
#X connect 21 0 20 0;
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