/usr/lib/pd/extra/iemmatrix/mtx_rand-help.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 | #N canvas 25 323 504 298 10;
#X text 51 7 fill a matrix with random values;
#X text 295 20 updated for;
#X obj 383 20 iemmatrix 0.2;
#X obj 432 46 matrix;
#X text 302 45 see also help for;
#X obj 434 72 random;
#X obj 59 148 mtx_rand;
#X obj 59 194 mtx_print;
#X obj 83 100 mtx_ones 6 3;
#X msg 83 82 bang;
#X msg 74 58 5 7;
#X msg 59 35 3;
#X msg 120 127 seed 12;
#X text 51 219 get a matrix containing;
#X text 51 232 random elements (0..1];
#X text 177 130 set seed;
#X connect 6 0 7 0;
#X connect 8 0 6 0;
#X connect 9 0 8 0;
#X connect 10 0 6 0;
#X connect 11 0 6 0;
#X connect 12 0 6 0;
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