CFLib.org – Common Function Library Project

FibCalc(x, y, top)

Last updated June 26, 2002

author

Phillip B. Holmes

Version: 1 | Requires: CF5 | Library: MathLib

Description:
This script Calculates the Fibonacci sequence (each integer is the sum of the two previous integers). Note that the function will also calculate the sequence for non-Fibonacci numbers.

Return Values:
Returns a comma-delimited list of numeric values.

Example:

<cfoutput>
#fibcalc(0,1,200)#<BR>
#fibcalc(1,1,200)#
</cfoutput>

Parameters:

Name Description Required
x First number in the Fibonacci sequence. Yes
y Second number in the Fibonacci sequence. Yes
top Ceiling for the Fibonacci number. The sequence will terminate when this value is reached. Yes

Full UDF Source:

/**
 * This script Calculates the Fibonacci sequence  (each integer is the sum of the two previous integers).
 * 
 * @param x 	 First number in the Fibonacci sequence. (Required)
 * @param y 	 Second number in the Fibonacci sequence. (Required)
 * @param top 	 Ceiling for the Fibonacci number.  The sequence will terminate when this value is reached. (Required)
 * @return Returns a comma-delimited list of numeric values. 
 * @author Phillip B. Holmes (pholmes@mediares.com) 
 * @version 1, June 26, 2002 
 */
function FibCalc(x,y,top){
  var sequence = arrayNew(1);
  var total = x+y;
  sequence[1] = x;
  sequence[2] = y;
  while (total LTE top) {
    ArrayAppend(sequence, total);
    x=y; 
    y=total;
    total=(x+y); 
  }
  return ArrayToList(sequence, ',');
}
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