/usr/lib/pd/extra/iemmatrix/mtx_roots.pd is in pd-iemmatrix 0.2-1.
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 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 | #N canvas 0 0 586 346 10;
#N canvas 296 357 512 426 companion_matrix 0;
#X obj 28 236 mtx_eye;
#X obj -109 219 mtx;
#X obj 179 87 list length;
#X obj 28 214 f;
#X obj 115 192 f;
#X obj 29 21 inlet;
#X obj -67 351 outlet;
#X obj 115 234 mtx_zeros;
#X obj -109 262 mtx_* -1;
#X obj 46 193 - 2;
#X obj -110 178 - 1;
#X obj 179 110 moses 3;
#X obj -207 177 list split 1;
#X msg -57 218 \$1;
#X obj -109 240 mtx_./ 1;
#X obj 28 46 t l b b l;
#X obj -68 314 mtx_concat col;
#X msg -109 198 size 1 \$1;
#X msg 115 213 \$1 1;
#X obj 28 281 mtx_concat row;
#X connect 0 0 19 0;
#X connect 1 0 14 0;
#X connect 2 0 11 0;
#X connect 3 0 0 0;
#X connect 4 0 18 0;
#X connect 5 0 15 0;
#X connect 7 0 19 1;
#X connect 8 0 16 0;
#X connect 9 0 3 1;
#X connect 9 0 4 1;
#X connect 10 0 17 0;
#X connect 11 1 10 0;
#X connect 11 1 9 0;
#X connect 12 1 1 0;
#X connect 13 0 14 1;
#X connect 14 0 8 0;
#X connect 15 0 12 0;
#X connect 15 1 3 0;
#X connect 15 2 4 0;
#X connect 15 3 2 0;
#X connect 15 3 13 0;
#X connect 16 0 6 0;
#X connect 17 0 1 0;
#X connect 18 0 7 0;
#X connect 19 0 16 1;
#X restore 100 135 pd companion_matrix;
#X obj 100 47 inlet;
#X obj 100 159 mtx_eig;
#X obj 182 223 outlet im;
#X obj 76 221 outlet re;
#X connect 0 0 2 0;
#X connect 1 0 0 0;
#X connect 2 0 4 0;
#X connect 2 1 3 0;
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