/usr/lib/pd/extra/pdp/pdp_conv_sobel_edge.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 12 13 14 15 16 17 18 19 20 21 | #N canvas 222 642 607 202 10;
#X obj 15 35 pdp_conv_sobel_hor;
#X obj 149 34 pdp_conv_sobel_ver;
#X obj 15 114 pdp_add;
#X obj 15 74 pdp_mul;
#X obj 149 71 pdp_mul;
#X text 123 105 this uses the horizontal and vertical sobel directional
masks squared as an edge detector.;
#X obj 14 -6 inlet;
#X obj 15 151 outlet;
#X obj 15 15 pdp_trigger p p;
#X connect 0 0 3 0;
#X connect 0 0 3 1;
#X connect 1 0 4 0;
#X connect 1 0 4 1;
#X connect 2 0 7 0;
#X connect 3 0 2 0;
#X connect 4 0 2 1;
#X connect 6 0 8 0;
#X connect 8 0 0 0;
#X connect 8 1 1 0;
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