/usr/lib/pd/extra/mapping/vector.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 31 | #N canvas 1 53 496 439 10;
#X obj 30 75 inlet;
#X obj 25 300 outlet;
#X text 73 300 output range: 0 to 1;
#X obj 232 299 outlet;
#X obj 164 73 inlet;
#X text 11 31 x-axis value;
#X text 167 30 y-axis value;
#X obj 25 269 / 1.41421;
#X text 92 269 (sqrt 2);
#X text 280 299 output range: 0 to 1;
#X text 245 371 released under the GNU GPL;
#X text 28 357 (C) Copyright 2005 Hans-Christoph Steiner <hans@at.or.at>
;
#X text 9 48 input range: -1 to 1;
#X text 168 48 input range: -1 to 1;
#X text 230 319 direction;
#X text 23 318 magnatude;
#X obj 29 159 float;
#X obj 76 127 trigger bang float;
#X obj 233 267 mapping/radians2mapping;
#X obj 153 197 zexy/cart2pol;
#X connect 0 0 16 0;
#X connect 4 0 17 0;
#X connect 7 0 1 0;
#X connect 16 0 19 0;
#X connect 17 0 16 0;
#X connect 17 1 19 1;
#X connect 18 0 3 0;
#X connect 19 0 7 0;
#X connect 19 1 18 0;
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