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#X obj 140 198 random 4;
#X obj 74 197 random 2;
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#X text 58 28 Random walk generator;
#X text 191 73 on/off;
#X text 384 220 output;
#X text 80 223 sign;
#X text 145 221 magnitude;
#X text 228 340 add prev value;
#X text 227 355 to random increment;
#X text 282 28 coercion to range 0-100 \; if out of range \, reflect;
#X text 281 58 us back in.;
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#X text 59 398 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).;
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