Reference.Random History

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December 24, 2009, at 04:04 AM by David A. Mellis -
Changed lines 7-9 from:
long random(max)\\
long random(min, max)
to:
random(max)\\
random(min, max)
Changed lines 16-17 from:
long - a random number between min and max - 1
to:
a random number between min and max-1 (''long'')
Changed lines 52-53 from:
* [[randomSeed]]
to:
* [[randomSeed]]()
October 13, 2008, at 05:11 PM by David A. Mellis -
Changed line 7 from:
long random(max)
to:
long random(max)\\
October 13, 2008, at 05:10 PM by David A. Mellis -
Changed lines 1-3 from:
!!long random(max) \\
long random(min, max)
to:
!!random()
Added lines 6-9:
!!!!Syntax
long random(max)
long random(min, max)
Changed lines 11-12 from:
min - lower bound of the random value, inclusive ''(optional parameter)''
to:
min - lower bound of the random value, inclusive ''(optional)''
September 27, 2007, at 06:06 AM by Paul Badger -
Changed lines 16-17 from:
If it is important for sequence of values generated by random() to differ on subsequent executions of a sketch, use randomSeed() to initialize the random number generator with a fairly random input, such as analogRead() on an unconnected pin.
to:
If it is important for a sequence of values generated by random() to differ, on subsequent executions of a sketch, use randomSeed() to initialize the random number generator with a fairly random input, such as analogRead() on an unconnected pin.
September 27, 2007, at 05:53 AM by Paul Badger -
Changed line 29 from:
// noise will cause the calls to randomSeed() to generate
to:
// noise will cause the call to randomSeed() to generate
Changed line 31 from:
// randomSeed() then shuffles the random function
to:
// randomSeed() will then shuffle the random function.
September 27, 2007, at 05:51 AM by Paul Badger -
September 27, 2007, at 05:50 AM by Paul Badger -
Changed lines 18-19 from:
Conversely, it can occasionally be useful to use pseudo-random sequences that repeat exactly. This can be accomplished by calling randomSeed() with a fixed number.
to:
Conversely, it can occasionally be useful to use pseudo-random sequences that repeat exactly. This can be accomplished by calling randomSeed() with a fixed number, before starting the random sequence.
September 27, 2007, at 05:49 AM by Paul Badger -
Changed lines 8-9 from:
min - lower bound of the random value, inclusive (optional parameter)
to:
min - lower bound of the random value, inclusive ''(optional parameter)''
September 27, 2007, at 05:49 AM by Paul Badger -
Changed lines 8-9 from:
min - lower bound of the random value, inclusive (optional parameter)
to:
min - lower bound of the random value, inclusive (optional parameter)
September 27, 2007, at 05:48 AM by Paul Badger -
Changed lines 8-11 from:
min - lower bound on the random value, inclusive (optional)

max - upper bound on the random number, exclusive
to:
min - lower bound of the random value, inclusive (optional parameter)

max - upper bound of the random value, exclusive
September 27, 2007, at 05:46 AM by Paul Badger -
Changed lines 26-27 from:
Serial.begin(19200);
to:
Serial.begin(9600);
Added lines 43-44:

delay(50);
September 27, 2007, at 05:44 AM by Paul Badger -
Deleted line 39:
Deleted line 42:
September 27, 2007, at 05:44 AM by Paul Badger -
Changed lines 29-30 from:
// noise will cause the calls to random() to generate
// different numbers each time the sketch runs.
to:
// noise will cause the calls to randomSeed() to generate
// different seed numbers each time the sketch runs.
// randomSeed() then shuffles the random function
Deleted lines 35-38:
// print a random number from 10 to 19
randNumber = random(10, 20);
Serial.println(randNumber);
Added lines 38-42:
Serial.println(randNumber);


// print a random number from 10 to 19
randNumber = random(10, 20);
Added line 44:
September 27, 2007, at 05:41 AM by Paul Badger -
Changed lines 18-19 from:
Conversely, it can occasionally be useful to use sequences pseudo-random numbers that repeat exactly. This can be accomplished by calling randomSeed() with a fixed number.
to:
Conversely, it can occasionally be useful to use pseudo-random sequences that repeat exactly. This can be accomplished by calling randomSeed() with a fixed number.
Changed lines 28-29 from:
// if analog input pin 0 is unconnected, this
// will cause the calls to random() to generate
to:
// if analog input pin 0 is unconnected, random analog
// noise will cause the calls to random() to generate
September 27, 2007, at 05:00 AM by David A. Mellis -
Changed lines 5-6 from:
The random function allows convenient access to pseudo-random numbers for use in sketches.
to:
The random function generates pseudo-random numbers.
Changed lines 8-21 from:
min - optional starting range (ie: from "50" - 300).

max - the largest random number returned (plus one).

In the current version of this function, the max parameter will not be returned, although the minimum will, so for example:

[@random(10); // returns numbers from 0 to 9 @]

[@random(-5, 5); // returns numbers from -5 to 4 @]

Consequently, enter a maximum parameter one larger than the maximum integer desired.

'''min''' and '''max''' are long integers so numbers between -2,147,483,648 and 2,147,483,647 are valid.
to:
min - lower bound on the random value, inclusive (optional)

max - upper bound on the random number, exclusive
Changed lines 13-14 from:
long - the random number.
to:
long - a random number between min and max - 1
Changed lines 16-19 from:
If it is important for a random number sequence to ''begin'' on a random number, then call the randomSeed() function using something for a parameter that is fairly random, such as millis(), or analogRead() on a pin with no electrical connection.

Conversely, it can occasionally be useful to use pseudo-random numbers that repeat exactly. This can be accomplished by calling randomSeed() with the same number as a parameter.
to:
If it is important for sequence of values generated by random() to differ on subsequent executions of a sketch, use randomSeed() to initialize the random number generator with a fairly random input, such as analogRead() on an unconnected pin.

Conversely, it can occasionally be useful to use sequences pseudo-random numbers that repeat exactly. This can be accomplished by calling randomSeed() with a fixed number.
Added lines 27-31:

// if analog input pin 0 is unconnected, this
// will cause the calls to random() to generate
// different numbers each time the sketch runs.
randomSeed(analogRead(0));
Changed lines 34-42 from:
void loop(){
randomSeed(analogRead(0));
// return a random number from 50 - 300
randNumber = random(50,301);

// example with only a range, which would return
// a number between 0 - 300
// randNumber = random(301);
Serial.println(r);
to:
void loop() {
// print a random number from 10 to 19
randNumber = random(10, 20);
Serial.println(randNumber);

// print a random number from 0 to 299
randNumber = random(300);
Serial.println(randNumber);
Changed lines 47-48 from:
* [[millis]]
to:
September 27, 2007, at 04:37 AM by Paul Badger -
Changed lines 10-11 from:
max - the largest random numbers you'd like returned.
to:
max - the largest random number returned (plus one).
Changed lines 18-19 from:
Consequently, enter a maximum parameter one larger than the maximum integer dersired.
to:
Consequently, enter a maximum parameter one larger than the maximum integer desired.
Changed lines 23-24 from:
long - returns the random number.
to:
long - the random number.
Changed lines 26-29 from:
If it is important for a random number series to ''begin'' on a random number, then call the randomSeed() function using something for a parameter that is fairly random, such as millis(), or analogRead() on a pin with no electrical connection.

Conversely it can occasionally be useful to use pseudo-random numbers that repeat exactly. This can be accomplished by calling randomSeed with the same number.
to:
If it is important for a random number sequence to ''begin'' on a random number, then call the randomSeed() function using something for a parameter that is fairly random, such as millis(), or analogRead() on a pin with no electrical connection.

Conversely, it can occasionally be useful to use pseudo-random numbers that repeat exactly. This can be accomplished by calling randomSeed() with the same number as a parameter.
September 27, 2007, at 04:31 AM by Paul Badger -
Changed lines 42-43 from:
randNumber = random(50,300);
to:
randNumber = random(50,301);
Changed line 46 from:
// randNumber = random(300);
to:
// randNumber = random(301);
September 27, 2007, at 04:31 AM by Paul Badger -
Changed lines 26-27 from:
If it is important for a random number series to ''begin'' on a random number, then call the randomSeed() function using something that is fairly random such as millis() or analogRead() on a pin with no electrical connection.
to:
If it is important for a random number series to ''begin'' on a random number, then call the randomSeed() function using something for a parameter that is fairly random, such as millis(), or analogRead() on a pin with no electrical connection.
September 27, 2007, at 04:30 AM by Paul Badger -
Changed lines 25-26 from:
!!!!Note: If it is important for a random number series to ''begin'' on a random number, then call the randomSeed() function using something that is fairly random such as millis() or analogRead() on a pin with no electrical connection.
to:
!!!!Note:
If it is important for a random number series to ''begin'' on a random number, then call the randomSeed() function using something that is fairly random such as millis() or analogRead() on a pin with no electrical connection.
September 27, 2007, at 04:29 AM by Paul Badger -
Changed lines 25-26 from:
Note: If it is important for a random number series to begin on a random number then call the randomSeed() function using something that is fairly random such as millis() or analogRead() on a pin with no electrical connection.
to:
!!!!Note: If it is important for a random number series to ''begin'' on a random number, then call the randomSeed() function using something that is fairly random such as millis() or analogRead() on a pin with no electrical connection.
September 27, 2007, at 04:29 AM by Paul Badger -
Changed lines 5-6 from:
The random function allows convenient access to pseudo-random numbers for use in an applications. NOTE: Use this after using the randomSeed() function.
to:
The random function allows convenient access to pseudo-random numbers for use in sketches.
Changed lines 12-13 from:
In the current version of this function, the max parameter will not be returned, although the minimum will so, for example:
to:
In the current version of this function, the max parameter will not be returned, although the minimum will, so for example:

[@random(10); // returns numbers from 0 to 9 @]
Changed lines 18-19 from:
Consequently enter a maximum parameter one more than the meximum dersired.
to:
Consequently, enter a maximum parameter one larger than the maximum integer dersired.
Added lines 25-28:
Note: If it is important for a random number series to begin on a random number then call the randomSeed() function using something that is fairly random such as millis() or analogRead() on a pin with no electrical connection.

Conversely it can occasionally be useful to use pseudo-random numbers that repeat exactly. This can be accomplished by calling randomSeed with the same number.
September 27, 2007, at 04:17 AM by Paul Badger -
Changed lines 5-6 from:
The random function allows you to return pseudo-random numbers for use in your applications. NOTE: Use this after using the randomSeed() function.
to:
The random function allows convenient access to pseudo-random numbers for use in an applications. NOTE: Use this after using the randomSeed() function.
Changed lines 10-11 from:
max - the overall range of random numbers you'd like returned.
to:
max - the largest random numbers you'd like returned.

In the current version of this function, the max parameter will not be returned, although the minimum will so, for example:

[@random(-5, 5); // returns numbers from -5 to 4 @]

Consequently enter a maximum parameter one more than the meximum dersired.
September 27, 2007, at 03:23 AM by Paul Badger -
Added lines 12-13:
'''min''' and '''max''' are long integers so numbers between -2,147,483,648 and 2,147,483,647 are valid.
May 27, 2007, at 02:33 AM by Paul Badger -
May 27, 2007, at 02:32 AM by Paul Badger -
Deleted lines 39-40:

[[HomePage | Reference Home]]
May 08, 2007, at 07:22 PM by David A. Mellis -
Deleted line 17:
int time;
Changed lines 25-26 from:
time = millis();
randomSeed(time);
to:
randomSeed(analogRead(0));
September 15, 2006, at 06:21 PM by David A. Mellis -
Changed lines 1-3 from:
!!long random(max)
!!long random(min, max)
to:
!!long random(max) \\
long random(min, max)
September 15, 2006, at 06:21 PM by David A. Mellis -
Changed lines 1-2 from:
!!long random([min,] max)
to:
!!long random(max)
!!long random(min, max)
September 11, 2006, at 05:15 PM by Jeff Gray -
Changed lines 1-2 from:
!!long random([start,] range)
to:
!!long random([min,] max)
Changed lines 7-10 from:
start - optional starting range (ie: from "50" - 300).

range - the overall range of random numbers you'd like returned.
to:
min - optional starting range (ie: from "50" - 300).

max - the overall range of random numbers you'd like returned.
September 11, 2006, at 05:05 PM by Jeff Gray -
Added lines 29-32:

// example with only a range, which would return
// a number between 0 - 300
// randNumber = random(300);
September 11, 2006, at 05:04 PM by Jeff Gray -
Added lines 1-38:
!!long random([start,] range)

!!!!Description
The random function allows you to return pseudo-random numbers for use in your applications. NOTE: Use this after using the randomSeed() function.

!!!!Parameters
start - optional starting range (ie: from "50" - 300).

range - the overall range of random numbers you'd like returned.

!!!!Returns
long - returns the random number.

!!!!Example

[@
int time;
long randNumber;

void setup(){
Serial.begin(19200);
}

void loop(){
time = millis();
randomSeed(time);
// return a random number from 50 - 300
randNumber = random(50,300);
Serial.println(r);
}
@]

!!!!See also
* [[randomSeed]]
* [[millis]]


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