/usr/lib/pd/extra/iemmatrix/mtx_roll-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 79 113 670 283 10;
#X text 458 17 updated for;
#X obj 546 17 iemmatrix 0.2;
#X obj 595 43 matrix;
#X text 465 42 see also help for;
#X text 194 36 tranpose matrices;
#X text 198 15 [mtx_roll];
#X obj 194 162 t a a;
#X obj 236 163 mtx_print org;
#X obj 194 220 mtx_print rolled;
#X msg 194 120 1 2 3 4 5;
#X obj 194 142 mtx_diag;
#X text 190 103 shift columns of a matrix;
#X floatatom 289 196 4 0 5 1 shift - -;
#X text 374 182 (0=no-shift \; 1=1-column-right \; -2=2-columns-left
\; ...);
#X obj 194 192 mtx_roll 1;
#X connect 6 0 14 0;
#X connect 6 1 7 0;
#X connect 9 0 10 0;
#X connect 10 0 6 0;
#X connect 12 0 14 1;
#X connect 14 0 8 0;
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