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2011-10-14T23:59:14Z

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Lola at 23:37, 14 October 2011

2011-10-14T23:37:21Z

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Random Moves adds something very subtle to your bot; for any animal creation they are essential I believe; let's have a look at the basic syntax:

task main() // Start of Code
{
while(true) // This just tells the snippet to go on ad on forever, since ther is nothing else to counter the ''while'' statement.
{
OnFwd(OUT_AC, 75); // Forward @ 75% of power
Wait(Random(600)); // For a duration random between 0 to 0.6 secs
OnRev(OUT_A, 75); // Then Backwards,
Wait(Random(400)); // For a random something between 0 and 0.4 secs.
} // Mind the { and } or it won't compile; '''kate''' would help you with colour and lines joining them
}

You'll notice this is quite simple: instead of giving a time parameter, you'll just write down Random(Field of Randomness) instead; In the above sample the 'Bot will go forward for any time between 0 to 600 millsecs, then go back for any value between 0 to 400 millisecs; That will give it a quite drunken behaviour!

If for calculation purpose, you need Real Full Blown Randowness, just write Random() this will return anything from -infinite to +infinite; it's actually your best shot at a "flip the coin" decision-making process

Randomization can be used at any place any figure would be entered, so Speed is a valid option too. And, last but not least, a random output can be a [[Integer]] too, let's re-work the simple script above to More randomness, with [[Integers]]:

int move_time, turn_time; //Define some integers
int fwd_speed, bck_speed; //Define some integers

task main() // Start of Code
{
while(true) // This just tells the snippet to go on ad on forever
{
move_time = Random(600); // random between 0 to 0.6 secs
turn_time = Random(400); // For a random something between 0 and 0.4 secs.
fwd_speed = Random(90); // random between 0 to 90% power
bck_speed = Random(70); // random between 0 to 70% power

OnFwd(OUT_AC, fwd_speed); // See '''fwd_speed = Random(90);'''
Wait(move_time); // See '''move_time = Random(600);'''
OnRev(OUT_A, bck_speed); // See '''bck_speed = Random(70); '''
Wait(turn_time); // See '''turn_time = Random(400);'''
}
}

That's it, the Thing will go forward at a random speed between 0 and 90% of power for a random amount of time included between 0 to 0.6 seconds, and quite the same, while with slightly different values, will happen backwards too.

Now that poses athreat: Immobilism; all this randomness may well generate values of ''Zero'' and your 'bot won'yt move, whis isn't fun.

For your next Lessons on Randomness, may I suggest you head over [[Drunken tribot v1|here]], [[Drunken tribot v2|here]] and [[Drunken tribot v3|there]]?

See you again on our Not Quite Encyclopedic resource.
[[Category:NXT]] [[Category:Snippets]]

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Admin: 1 revision

Lola at 23:37, 14 October 2011