/usr/share/puredata/doc/2.control.examples/22.random-walk.pd is in puredata-doc 0.47.1-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#X msg 60 282 1;
#X text 39 9 Random walk generator;
#X text 143 64 on/off;
#X text 298 152 output;
#X text 22 375 A random walk is a special case of a Markov chain \,
in which the states are integers and the transitions add or subtract
a small amount from the previous state to get a new one. Here the "f"
holds the state. When it gets a bang \, the previous state is added
to a random number (from 1 to 4) multiplied by a random sign (-1 or
1). The new value is then coerced into the range from 0 to 100;
#X text 35 235 sign;
#X text 113 234 magnitude;
#X text 203 313 add prev value;
#X text 200 330 to random increment;
#X text 256 30 coercion to range 0-100 \; if out of range \, reflect
;
#X text 255 60 us back in.;
#X text 323 492 updated for Pd version 0.37-1;
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