CFML Reference

Randomize

Description

Seeds the ColdFusion random number generator with an integer number. Seeding the generator helps ensure that the Rand function generates highly random numbers.

Return value

A non-random decimal number, in the range 0 - 1.

Category

Mathematical functions

Syntax

Randomize(number)

See also

Rand, RandRange

Parameters

Parameter	Description
number	A number

Usage

Call this function before calling Rand. Although this function returns a decimal number, it is not a random number.

Example

<h3>Randomize Example</h3>
<p>Call Randomize to seed the random number generator. This helps 
to ensure the randomness of numbers generated by Rand.
<cfif IsDefined("FORM.myRandomInt")>
  <cfif IsNumeric(FORM.myRandomInt)>
    <cfoutput><p><b>Seed value is #FORM.myRandomInt#</b>
     </cfoutput><br>
    <cfset r = Randomize(FORM.myRandomInt)>
    <cfloop index = "i" from = "1" to = "10" step = "1">
      <cfoutput>Next random number is #Rand()#</cfoutput><br>
    </cfloop><br>
  <cfelse>
    <p>Please enter a number.
  </cfif>
</cfif>
<form action = "randomize.cfm">
<p>Enter a number to seed the randomizer:
<input type = "Text" name = "MyRandomInt">
<p><input type = "Submit" name = "">
</form>

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