/usr/lib/pd/extra/pdp/pdp_m_inverse.pd is in pd-pdp 1:0.14.1-3build1.
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 | #N canvas 805 557 415 150 10;
#X obj 21 49 pdp_m_LU;
#X obj 21 24 inlet;
#X obj 21 103 outlet;
#X text 150 31 computes a matrix inverse using the;
#X text 149 48 LU decomposition (PA = LU);
#X text 148 84 (uses double precision processing);
#X obj 21 77 pdp_m_LU_inverse;
#X connect 0 0 6 0;
#X connect 1 0 0 0;
#X connect 6 0 2 0;
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