/usr/lib/pd/extra/pdp/pdp_cheby-help.pd is in pd-pdp 1:0.14.1-3+b1.
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 | #N canvas 117 219 672 516 10;
#X msg 67 108 coef 0 \$1;
#X floatatom 67 84 5 0 0;
#X floatatom 137 84 5 0 0;
#X msg 137 108 coef 1 \$1;
#X floatatom 206 83 5 0 0;
#X msg 206 108 coef 2 \$1;
#X floatatom 275 84 5 0 0;
#X msg 275 108 coef 3 \$1;
#X floatatom 243 359 5 0 0;
#X text 122 394 creation arg: order (nb coefs = order + 1);
#X text 123 410 (default = minimal order = 2);
#X msg 243 309 reset;
#X obj 21 46 pdp_help_input;
#X msg 21 16 start;
#X msg 70 16 stop;
#X obj 21 445 pdp_help_output;
#X text 296 359 right inlet: number of iterations;
#X text 295 308 set all coefs to 0;
#X msg 243 338 1;
#X msg 243 267 chanmask \$1;
#X floatatom 243 244 5 0 0;
#X text 157 63 set individual coefficients;
#N canvas 0 0 450 300 graph1 0;
#X array mapping 64 float 1;
#A 0 -0.908307 -0.86545 -0.794021 -0.76545 -0.694021 -0.622593 -0.451164
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0.534549 0.505978 0.477406 0.448835 0.420264 0.348835 0.298835 0.148835
0.0845496 -0.0511645 -0.151164 -0.236879 -0.322593 -0.436878 -0.436878
-0.436878 -0.436878 -0.422593 -0.394021 -0.36545 -0.308307 -0.26545
-0.136879 0.120264 0.291692 0.434549 0.534549 0.591692 0.648835 0.677406
0.677406 0.663121 0.648835 0.648835 0.634549 0.605978 0.605978 0.605978
0.605978 0.605978 0.605978 0.634549 0.648835 0.677406 0.705978 0.76312
0.848835 0.934549 0.977406;
#X coords 0 1 63 -1 200 140 1;
#X restore 427 20 graph;
#X msg 242 217 approx mapping;
#X obj 21 158 pdp_t;
#X text 418 165 -1 ----------- 0 ----------- 1;
#X obj 242 190 spigot;
#X obj 279 167 tgl 15 0 empty empty empty 0 -6 0 8 -262144 -1 -1 0
1;
#X text 361 216 approximate a mapping function;
#X obj 21 403 pdp_cheby 10;
#X connect 0 0 29 0;
#X connect 1 0 0 0;
#X connect 2 0 3 0;
#X connect 3 0 29 0;
#X connect 4 0 5 0;
#X connect 5 0 29 0;
#X connect 6 0 7 0;
#X connect 7 0 29 0;
#X connect 8 0 29 1;
#X connect 11 0 29 0;
#X connect 12 0 24 0;
#X connect 13 0 12 0;
#X connect 14 0 12 0;
#X connect 18 0 8 0;
#X connect 19 0 29 0;
#X connect 20 0 19 0;
#X connect 23 0 29 0;
#X connect 24 0 29 0;
#X connect 24 1 26 0;
#X connect 26 0 23 0;
#X connect 27 0 26 1;
#X connect 29 0 15 0;
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