/usr/lib/pd/extra/zexy/polyfun-help.pd is in pd-zexy 2.2.5-2.
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 | #N canvas 137 170 448 308 10;
#X text 338 10 part of zexy;
#X text 122 40 calculate a polynomial function;
#X text 289 279 updated for zexy-2.1;
#X floatatom 45 164 0 0 0 0 x - -;
#X floatatom 45 264 0 0 0 0 y - -;
#X msg 89 189 1 2;
#X text 128 190 y=2x+1;
#X msg 110 214 3 0 -1;
#X text 166 215 y=3-x^2;
#X text 32 80 on the right inlet you give the coefficients (a0..aN)
of the polynomial function: y=a0+a1*x+a2*x^2+...+aN*x^N;
#X text 33 109 the length of the coefficient list determines the order
of the polynomial function.;
#X obj 60 39 polyfun;
#X obj 45 238 polyfun;
#X connect 3 0 12 0;
#X connect 5 0 12 1;
#X connect 7 0 12 1;
#X connect 12 0 4 0;
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