chnfind with timechannels

Similar Questions

• Find the exact index of maximum PNo() local and ChnFind() seem to be problematic

  Good day to all experts DIAdem!

  I am after some help and wonder if what I intend to do is possible, as much as tiara fucntions are concerned.

  I have a few cyclical data (continuous acquired as a set of data), which I am able to identify individual events. Within each of these events, I use the StatBlockCalc, so calculate the minimum and maximum local power (in the range of the specified index). I would then use the calculated maximum, a specific channel, then 'read' effective competition on other channels.

  I tried to use the ChnFind and PNo and both give results that often fall beyond the top and bottom of the index for this event. I believe that this is due to the fact that these search functions for a nearest value of the value in question and NOT the exact value for (rounding errors may also play a role). Please note this is not a criticism of the functions, because I believe that what I am asking is perhaps more by the high-performance computing (as opposed to hunting for the nearest value).

  So my question is - this feasible? To calculate a local maximum, and then use this value index reading on the remaining channels (to determine the values to the maximum).

  I hope that what I am asking is clear, if not so, feel free to ask away.

  Kind regards

  Dan

  Hi Dan,.

  If you want to attack this from the rounded side error, then I suggest to insert the ValEqual() function in your search expression - it has been designed to avoid rounding problems you seem like you're running.  My other recommendataion would be to abandon PNo() and use instead of ChnFind() with the known since your window index the starting index.  This action runs more quickly and find the extremum of right.

  Brad Turpin

  Tiara Product Support Engineer

  National Instruments

• Problem with ChnFind

  I used this function successfully elsewhere in my scripts, but for some reason that I'm having a problem here.

  Please take a look and tell me if you see the question...

  "Determine which HCM1 evolved during the triggering event and the delay signals
  
  Sun k, m, z, 1, ResultsGroup, ChangeTrue, ChangeFalse, group, result, Zero
  
  Set ResultsGroup = Data.Root.ChannelGroups.Add ("Results_Trig")
  
  Set ChangeTrue = ResultsGroup.Channels.Add ("HCM1_ChangeTrue_Trig", DataTypeString)
  
  Set ChangeFalse = ResultsGroup.Channels.Add ("HCM1_ChangeFalse_Trig", DataTypeString)
  
  result = TrigEvent - 5 ' TrigEvent in this case was 112, result = 107
  
  msgboxdisp (result) ' result = 107 confirmed with this
  For k = 05:54 ' decreased from 2 to 15 for any group of 6 for troubleshooting
  
  Set Group = Data.Root.ChannelGroups (k)
  
    M = 1 to Group.Channels.Count
  
    A = ChnFind ("Ch (Data.Root.ChannelGroups (k). Channels (m). (Name) > 0 ", result)
  
    Zero = ChnFind ("Ch (Data.Root.ChannelGroups (k). Channels (m). (Name) = 0 ", result)
  
    msgboxdisp (Data.root.ChannelGroups (k). Channels (m). Name)
  
    msgboxdisp (One) ' all channels back 0  Many must return to 112 instead. (length of the canal is 1997)
  
    msgboxdisp (Zero) ' all channels return 0.
  
    <= enddatarow="">
  
      z = ChangeTrue.Size + 1
  
      ChangeTrue (z) = Channel.Name
  
    <= enddatarow="">
  
      z = ChangeFalse.Size + 1
  
      ChangeFalse (z) = Channel.Name
  
    On the other
  
    End If
  
    Next am
  
  Next ' k

  Hi 2Pale4TX,

  I do not understand why your orders ChnFind not work at all.  You declare 'k' and 'm' with "Dim" as local variables, and then you reference them in the expression of ChnFind(), where only global variables should be accepted.  Try this instead and see what happens:

    T1 = Data.Root.ChannelGroups (k). Channels (m). GetReference (eRefTypeNameName)
  
    A = ChnFind ("Ch (T1) > 0", result)
  
    Zero = ChnFind ("Ch (T1) = 0", result)

  Brad Turpin

  Tiara Product Support Engineer

  National Instruments

• Cannot search timestamp with chnfind channel

  We are trying to create a script that will cut our datasets in days. For the moment we build a function that uses ChnFind to locate the position of the first entry, whose date is superior at midnight of each day and which allows to divide the dates. However, we cannot have the chnfind function works.

  Initially, we tried the research of the date as a timestamp, but the chnfind seemed unable to treat - he kept saying he was expecting one), but nothing seemed to miss.

  Ch("0R1R1W0FResults/hitsTimestamp") > 00:00:00.0000 18/03/2016

  Is the result which is enters the function (after that double quotes are discussed), but it is throwing an error.

  We then tried to convert using TTR for comparison, but that threw a type mismatch.

  Finally, we tried to use instr to find the first value that contains the correct date, but which also lifted a type mismatch.

  Is it possible to run these comparisons on a channel of timestamp? If so, how?

  It turns out that we have access to our table incorrectly, if the system is working very well now.

• Time offset in the middle with string

  I have a time string that has a a 'step' in it.  I'm going to blame it on the sun spots...  In any case, for some reason, my system has a big jump in the weather channel, which is ruining an analysis.  I have about 40 different channels explicit time and only the part of the exhibition of this problem.  Please take a look at the attached screen see the problem.

  I can't go back one collects the data, so I need to fix the time string as it is now.  Any ideas how can I fix?  The data are self-explanatory, so I can't create a channel of implicit time.  Basically, I need to compensate for this point channel from the line 1861119 and versions later.  Since I have so many channels of time checking, I would like to create a script.  I will also use the script to correct automatically, if it were to happen again in the future.

  Any help is appreciated.

  

  Hi Mr. candle.

  Here is the script that I created just to filter these spikes.  The last two lines are commented out, but in the production would be commented on in.  The 3rd in the last line would disappear in the production, but I left it there for you to compare the new channel of origin with new time range.

  Const MaxDelta = 1,00' seconds
  
  Const NewDelta = 0.01 ' seconds
  
  Set Group = Data.Root.ActiveChannelGroup
  
  Set TimeChannel = Group.Channels ("Time")
  
  Set DeltChannel = Group.Channels.Add ("Delta", DataTypeFloat64)
  
  Call ChnDeltaCalc (TimeChannel, DeltChannel)
  
  Call ChnAreaInsert0 (DeltChannel, 1, 1)
  
  L1 = TimeChannel.Properties ("Number"). Value
  
  L2 = DeltChannel.Properties ("Number"). Value
  
  R1 = MaxDelta
  
  R2 = NewDelta
  
  Call FormulaCalc ("Ch (L2): = Ch (L2) * (Ch (L2)= R1) '")
  
  DeltChannel.Values (1) = TimeChannel.Values (1)
  
  Call ChnSum (DeltChannel, DeltChannel)
  
  "Call the ChnSum (DeltChannel, TimeChannel)."
  
  "Call the Group.Channels.Remove (DeltChannel.Name)."

  Brad Turpin

  Tiara Product Support Engineer

  National Instruments

• Using the string Variable name to ChnFind

  Overview - I find crossing points of zero on a set of data so that I can calculate the phase shift of channel to another in my data.

  Small image - I start by finding the zero 1 cross in the data, once I found I want to use the index to find the next and so on

  Problem

  The posted script comes from looking for the 1st pass by zero before moving on to the next channel. The problem is that I can't find out do my group and channel changes with loops.

  Option Explicit  ' force explicit declaration of all variables in a script.
  
  Dim intCount, intChan ' loop variables
  
  Dim z
  
  IntCount = 2 GroupCount-1 ' groups
  
  Call GROUPDEFAULTSET (intCount) ' change the current group
  
    IntChan = 1 to ChnNoMax ' Browse channels
  
       Z = ChnFind ("Ch(""[intCount]/[intchan]"")<0") 'this="" does="" not="" work,="" but="" i'm="" not="" sure="" how="" to="" fix="">
  
      MsgBox (z)
  
    next
  
  

  I don't know I'm missing something obvious.

  MK

  Hi Michael,

  You need not global variables to simplify this, but I would certainly use object variables to simplify.  When indexing of groups or channels, it is easier to use the variable of index with the Data.Root.ChannelGroups collect or Group.Channels collection directly.  I also prefer to store the group object and the channel object in a variable.  For example, you can then use Channel.DataType to add exactly the same string data to the new group coming from the old group.  You can also easily get the name, unit and all sorts of other properties directly from the object variable.  I prefer to use a separate group object variable to reduce congestion in the colde, although it adds 2 lines to your example of code snippet.

  Set FromGroup = Data.Root.ChannelGroups (intCount)
  
  Set FromChannel = FromGroup.Channels (intChan)
  
  Define participatory = Data.Root.ChannelGroups ("Index" & FromGroup.Name)
  
  The rise in the value  = ToGroup.Channels.Add (FromChannel.Name & "Rising",  DataTypeChnFloat64)
  
  Fall in the value = ToGroup.Channels.Add (FromChannel.Name & "Falling", DataTypeChnFloat64)

  Brad Turpin

  Tiara Product Support Engineer

  National Instruments

• Insert data into an existing timechannel

  Hello

  I'm trying to insert data into an existing timechannel. To illustrate my use case, I prepared a few data :

  Absolute timechannel D1 D2 D3
  14.02.2013 03:22:51.3930 - 4-92-703
  14.02.2013 03:22:52.3930 - 4-92-697
  14.02.2013 04:06:19.7280 - 1-75-674
  14.02.2013 04:06:20.7280 - 1-75-696

  As you can see there is a chronological gap between the second and the third group of data. Now, I want to insert a line with NoValues in this interval.
  The data has been saved with a sampling rate of 1 Hz. After processing the data, they should look like this:

  Absolute timechannel D1 D2 D3
  14.02.2013 03:22:51.3930 - 4-92-703
  14.02.2013 03:22:52.3930 - 4-92-697
  14.02.2013 03:22:53.3930 NV NV NV
  14.02.2013 04:06:19.7280 - 1-75-674
  14.02.2013 04:06:20.7280 - 1-75-696

  Insertion of the NoValues in the data channel works very well with 'DataBlInsertVal '. But I'm having a hard time to achieve the same in the timechannel. Especially with a dependency on the sampling rate.
  Someone has tried to do the same thing or has some tips how to do this? The main objective is to avoid reporting to connect the data points on this chronological gap.

  Best regards, Marc

  Hi Marc,

  I tried what you wanted to do and he worked with DIAdem 2012 without any problem.

  I used the attached file and copy the following code:

  Call DataBlInsertVal(Data.Root.ChannelGroups(1).Channels("Time"), 13, 1, NV)
  

  Can you try this line with my file?

  Cheers, RMathews

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