confusing. Basically it uses probability functions to determine the number
of nights a plane may need to overnight at a certain airport, based upon the
costs and expected business for a certain period of time. I am in the
process of translating it from VB-Access, where it was originally written.
<!--- get the params --->
<cfquery name="get_costmodel_params" datasource="Analytics">
Select * from nltx_costmodel_parameters
</cfquery>
<!--- set basic params --->
<cfset numPeriods = get_costmodel_params.num_periods>
<cfset periodsPerDay = numPeriods/7>
<cfset nextNight = (periodnumber/periodsPerDay + .99) * periodsPerDay>
<cfset lastNight = (periodnumber/periodsPerDay) * periodsPerDay>
<cfset missionsToday = get_costmodel_params.MissionsToday_Model>
<cfset missionsWeek = get_costmodel_params.MissionsWeek_Model>
<cfset profitablePercent = get_costmodel_params.ProfitablePercent>
<cfif trim(ac_Type) is "DA-20">
<cfset planesUp = get_costmodel_params.SmallPlanesUp_Model>
<cfset stdDev = get_costmodel_params.Std_Dev_Small>
<cfelse>
<cfset planesUp = get_costmodel_params.LargePlanesUp_Model>
<cfset stdDev = get_costmodel_params.Std_Dev_Large>
</cfif>
<cfquery name="get_airport" datasource="analytics">
Select * from NLTX_costmodel_airport_stats where ICAO = '#airport#'
</cfquery>
<cfif get_airport.recordcount is 0>
<cfquery name="get_brother_airport" datasource="analytics">
Select * from NLTX_costmodel_airport_brother where ICAO = '#airport#'
</cfquery>
<cfif get_brother_airport.recordcount gt 0>
<cfquery name="get_airport" datasource="analytics">
Select * from NLTX_costmodel_airport_stats where ICAO =
'#get_brother_airport.BigBrother_ICAO#'
</cfquery>
</cfif>
</cfif>
<cfif isDefined("get_brother_airport.recordcount") AND
get_brother_airport.recordcount gt 0>
<cfset airport = get_brother_airport.BigBrother_ICAO>
<cfelse>
<cfset airport = airport>
</cfif>
<cfif trim(ac_Type) is "DA-20">
<cfset percentUse = 1 - get_airport.Big_Percent>
<cfelse>
<cfset percentUse = 1>
</cfif>
<cfquery name="get_demands" datasource="analytics">
SELECT
nltx_costmodel_airport_demand.Period,
nltx_costmodel_airport_demand.Percent AS Specific,
nltx_costmodel_period_demand.Percent AS Overall
FROM nltx_costmodel_airport_demand
INNER JOIN
nltx_costmodel_period_demand ON nltx_costmodel_airport_demand.Period =
nltx_costmodel_period_demand.Period
WHERE (((nltx_costmodel_airport_demand.ICAO) = '#airport#'))
</cfquery>
<!--- calculate demand that should happen today --->
<cfset i = lastNight + 1>
<cfset sumToday = 0>
<cfloop index = "i" from="1" to="#nextNight#">
<cfloop query="get_demands">
<cfif get_demands.period is i>
<cfset sumToday = sumToday + get_demands.overall>
</cfif>
</cfloop>
</cfloop>
<!--- calculate demand for the rest of the day --->
<cfset j = periodnumber + 1>
<cfset sum = 0>
<cfset sum2 = 0>
<cfloop index="j" from="1" to="#nextNight#">
<cfloop query="get_demands">
<cfif get_demands.period is j>
<cfset sum = sum + get_demands.period * get_demands.overall / sumToday>
<cfset sum2 = sum2 + get_demands.overall / sumToday>
</cfif>
</cfloop>
</cfloop>
<cfset lambda = sum*missionsToday*profitablePercent*percentUse>
<cfset lambda2 = sum2*missionsToday*profitablePercent*percentUse>
<!--- PoissonProbability for lambda --->
<cfset lambda_param = lambda>
<cfset stopIt = numberplanes + 1>
<cfinclude template="functions/func_poissonProbability.cfm">
<!--- this is the likelihood that there will not be enough demand to cover
all of the planes here. --->
<cfset nights = PoissonProbability>
<!--- this is the likelihood that the plane gets out before having to
spend the night. --->
<cfset probGone = 1 - nights>
<cfset count = 0>
<cfloop condition="count lt 3 AND probGone lt .95">
<cfif nextNight is numPeriods>
<cfset nextNight = periodsPerDay>
<cfset lastNight = 0>
<cfelse>
<cfset lastNight = nextNight>
<cfset nextNight = nextNight + periodsPerDay>
</cfif>
<cfset x = int(lastNight + 1)>
<!--- <cfset count = count + 1> --->
<cfloop condition="x lte nextNight">
<cfloop query="get_demands">
<cfif get_demands.period is x>
<cfset lambda = lambda + get_demands.specific * get_demands.overall *
profitablePercent * missionsWeek * percentUse>
<cfset lambda2 = lambda2 + get_demands.overall * profitablePercent *
missionsWeek * percentUse>
<cfbreak>
</cfif>
</cfloop>
<cfset x = x + 1>
</cfloop>
<!--- PoissonProbability for lambda --->
<cfset lambda_param = lambda>
<cfset stopIt = numberplanes + 1>
<cfinclude template="functions/func_poissonProbability.cfm">
<cfset tempVal = PoissonProbability>
<cfset lambda_param = lambda2>
<cfset stopIt = planesUp>
<cfinclude template="functions/func_poissonProbability.cfm">
<cfset tempVal2 = PoissonProbability>
<cfif tempVal2 gt tempVal>
<cfset tempVal = .75 * tempVal2 + .25 * tempVal>
</cfif>
<cfoutput>new tempVal#tempVal#</cfoutput><br>
<cfset nights = nights + tempVal * (1 - probGone)>
<cfset probGone = (1 - probGone) * (1 - tempVal) + probGone>
<cfset count = count + 1>
</cfloop>
I
<cfoutput>#probGone#<br>#nights#</cfoutput>
The PoissonProbability function being included is here:
<cfparam name="lambda_param" default="">
<cfparam name="stopIt" default="">
<cfset value = Exp(lambda_param)>
<cfset current = value>
<cfloop index = "count" from="1" to="#stopIt#">
<!--- current is the probability that there will be exactly 'count'
missions --->
<cfset current = current * lambda_param / count>
<cfset value = value + current>
</cfloop>
<cfset PoissonProbability = value>
-----Original Message-----
From: Barney Boisvert [mailto:[EMAIL PROTECTED]
Sent: Friday, March 12, 2004 2:26 PM
To: CF-Talk
Subject: RE: Interesting Numbers
What's the manipulation that's yielding this result?
> -----Original Message-----
> From: John Stanley [mailto:[EMAIL PROTECTED]
> Sent: Friday, March 12, 2004 11:18 AM
> To: CF-Talk
> Subject: Interesting Numbers
>
> All,
> As a result of mathematical manipulations, I am getting
> the following
> result in CFMX.
>
>
> 1.#INF
>
>
> which, I assume means 1. followed by a very large number of
> decimal places.
>
>
> If this assumption is correct, then how can I show this
> number to say one or
> two or three decimal places? Or is this even possible?
>
>
> If this assumption is not correct, then what does the #INF mean?
>
>
> TIA
>
>
> John
>
>
>
>
>
>
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