[amibroker] peak - trough with variable

["Esteban" <ygroups@xxxx>]

I'm wanting to find the last 
peak based on a fixed number of points, rather than percentage. So I set a 
variable to the fixed points value I want divided by the high * 100 togive 
me a percentage to use in the peak formula. But I get an error. Maybe the 
function needs a  value not subject to fluctuation for  its 
underlying calculations. Is there a way I can use this function with a fixed 
number of points?
 
MinRetracement = <FONT 
color=#ff00ff>6/C * 100 ; Thisgives a 
value of 1.2 percent when C =500.


PeakValue = <FONT 
color=#0000ff>Peak(H,1.2,1) ; This 
finds the peaks like I want, when price is in the range of 500.
PeakValue Peak(H,MinRetracement,1); Gives 
an error.
Any ideas welcome.
Esteban