Calculate individual channel values in absolute terms

[Magnet_Christian]

Hello,

I have a question and I would like to calculate the individual values of a channel line by line.

Here is an example:

Line	Channel 1	ABS calculated
1	0	0
2	5	5
3	5	0
4	10	5
5	-10	20
6	0	10

Row 1 minus row 2 is calculated absolutely, the result in column ABS calculated in row 2 is therefore 5.

The same with row 2 minus row 3, in column ABS calculated in row 3 again the new value 0.

The whole thing continues row by row, of course. In Excel, this would be the classic formula =ABS(A1-A2) and simply copy this down for each additional row. How could I make this possible here in Diadem? I haven't found anything suitable yet. Maybe someone can help me?

Many thanks and best regards

[müller+krahmer]

There are different approaches. You can write a script like that:

dim i, objChn

set objChn = Data.Root.ChannelGroups(1).Channels

Call objChn.Add("Channel 2", DataTypeFloat64)

for i = 2 to objChn("Channel 1").Size
  objChn("Channel 2").Values(i) = abs(objChn("Channel 1").Values(i) - objChn("Channel 1").Values(i - 1))
next

or use the channel function "calculate differences" and afterwards calculate the absolute value of the result channel using the calculator:

ch("[1]/Delta") = abs(ch("[1]/Delta"))

[müller+krahmer]

You can write a script:

dim i, objChn
set objChn = Data.Root.ChannelGroups(1).Channels
Call objChn.Add("Channel 2", DataTypeFloat64)
for i = 2 to objChn("Channel 1").Size
  objChn("Channel 2").Values(i) = abs(objChn("Channel 1").Values(i) - objChn("Channel 1").Values(i - 1))
next

Or you can use the "calculate differences" function in ANALYSIS and the calculate the absolute values using the Calculator:

ch("[1]/Delta") = abs(ch("[1]/Delta"))