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Chapter 15 Functions

15-9

RND (Function)

Function

Generates random numbers from 0 to 1.

Format

RND (<Expression>)

Explanation

According to the value in <Expression>, processing varies as shown in the

table below.

<Expression> applies to integer values. If a real value is designated, it is

rounded down and converted to an integer.

Value of

Expression

Processing

Expression

< 0

<Expression> is applied as the seed value for the random

number. If the seed value is the same, the return value of the

RND function is always the same.

Expression

= 0

A random number previously generated is taken. Zero is returned

if no random number is generated after the robot controller power

is turned ON.

Expression

> 0

The next random number in the random number sequence is

generated.

Explanation: For the RND function, a value from 0 to 1 inclusive is

returned. Depending on the argument value, the

random number returned by the RND function will vary.

As long as the initial seed value is the same, the random

number sequence returned by a series of RND functions

is the same. This is because each consecutive RND

function generates the next random number using the

previous random number in the random number system

as the seed value.

Remark: When the seed value in the random number is the same, the

random number sequence obtained is the same. To obtain

different random numbers each time, use the return value of

the TIMER function as a seed value.

Example

DIM array(10) As Single

array(0) = RND(-TIMER) 'The seed value for the random number is set using the

'TIMER function.

FORI1=1TO9

array(I1) = RND(1) 'Obtains random numbers.

NEXT I1

1 2 ... 452 453 454 455 456 457 458 459 460 461 462 ... 691 692

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