/usr/lib/pd/extra/mapping/quadratic.pd is in pd-mapping 0.2.1-1.
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 1 53 589 471 10;
#X obj 22 10 inlet;
#X obj 412 9 inlet;
#X obj 174 405 outlet;
#X obj 270 10 loadbang;
#X obj 167 9 inlet;
#X obj 167 50 purepd/float_argument \$1;
#X obj 412 50 purepd/float_argument \$2;
#X obj 167 97 select 0.5;
#X obj 224 149 float;
#X msg 167 121 0.50001;
#X text 225 121 prevent divide by 0;
#X obj 271 213 expr 1 - 2*$f1;
#X obj 22 250 expr (sqrt($f2*$f2 + $f3*$f1) - $f2) / $f3;
#X obj 175 309 expr (1 - 2*$f2)*($f1*$f1) + (2*$f2)*$f1;
#X connect 0 0 12 0;
#X connect 1 0 6 0;
#X connect 3 0 5 0;
#X connect 3 0 6 0;
#X connect 4 0 5 0;
#X connect 5 0 7 0;
#X connect 6 0 13 1;
#X connect 7 0 9 0;
#X connect 7 1 8 0;
#X connect 8 0 11 0;
#X connect 8 0 12 1;
#X connect 9 0 8 0;
#X connect 11 0 12 2;
#X connect 12 0 13 0;
#X connect 13 0 2 0;
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