integrating starting at t=0 when ch. contains pre-trig data

[cmoore@exponent]

Looking for an efficient method for integrating a channel (starting at time = 0) when that channel contains pre-trigger data (starts at -.1 sec)

[Walter_Rick]

Hi,

I hope this short VBScript is the functionality you are looking for:

Option Explicit
' decalration
Dim iLoop, iLoopMax, iChnNo

' save original channel
call formulacalc("ch('X_Chn_Cop') := ch('X_Chn')")
' find line with first value = 0
call formulacalc("L1 := find('X_Chn_Cop' >= 0)")

'loop to set NOVALUES which not will be calculated
for iLoop = 1 to iLoopMax
chdX(iLoop, iChnNo) = Null
next

' get channel no for CHDX
iChnNo = cno("X_Chn_Cop")
' set loop end
iLoopMax = L1 - 1

' integrate
Call CHNINTEGRATE("X_Chn_Cop","Input channel for Y Values","Y_integral_1")

Best regards

Walter