CFLib.org – Common Function Library Project

FibGen(x, y, numSeq)

Last updated June 26, 2002

author

Rob Brooks-Bilson

Version: 1 | Requires: CF5 | Library: MathLib

Description:
Returns the Fibonacci sequence to n places given a starting point of x and y (each integer is the sum of the two previous integers). Note that the function will also calculate the sequence for non-Fibonacci numbers. Based on FibCalc() by Phillip B. Holmes (pholmes@mediares.com).

Return Values:
Returns a comma-delimited list of numbers.

Example:

<cfoutput>
#FibGen(0,1,10)#<BR>
#FibGen(1,1,10)#
</cfoutput>

Parameters:

Name Description Required
x First number in the sequence. Yes
y Second number in the sequence. Yes
numSeq Number of elements to generate for the sequence. Yes

Full UDF Source:

/**
 * Returns the Fibonacci sequence to n places given a starting point of x and y.
 * 
 * @param x 	 First number in the sequence. (Required)
 * @param y 	 Second number in the sequence. (Required)
 * @param numSeq 	 Number of elements to generate for the sequence. (Required)
 * @return Returns a comma-delimited list of numbers. 
 * @author Rob Brooks-Bilson (rbils@amkor.com) 
 * @version 1, June 26, 2002 
 */
function FibGen(x,y,numSeq){
  var sequence = arrayNew(1);
  var total = x+y;
  var i=1;
  sequence[1] = x;
  sequence[2] = y;
  while (i LTE numSeq-2) {
    total=(x+y); 
    ArrayAppend(sequence, total);
    x=y; 
    y=total;
    i=i+1;
  }
  return ArrayToList(sequence, ',');
}
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