Igor newbie needs a small bit of help

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Fri, 07/26/2013 - 06:05 am

Hi,

I am new to IGOR coding and was hoping a generous member could help me code a small script.
This would help me tremendously get started with my project.

I have 10 waves (named 1 thru 10) in a folder called exp1 The organization of the folders is: root/6_12_13/animal1/exp1

I want to make a function that does the same operation to each wave in this folder.
In this case, subtract the first value in a wave from the entire wave and then divide these numbers by the initial first value. or (wave1 - first value wave1) / first value wave1

Ideally the function would create new waves and keep the original waves.

Any help would be so much appreciated. Thanks!
The wave operations are fairly simple but we first need to consider the data folders to make this code robust. I am assuming you will be changing the date/animal number based on your data currently being examined. And it is likely that your data won't always be in a folder named exp1.

I think the best course of action here would be to use the WaveSelectorWidget in a panel to allow the user to browse/select a wave to process. This gives you access to the data folder path of interest, which is necessary to ensure the routine works on the data in the appropriate folder without require the user to first set the active data folder.

The WaveList function will allow you to work on any number of waves (not limited to 10) in a for loop.

July 26, 2013 at 06:37 am - Permalink

I thick for your purpose the GetBrowserSelection is useful:
You choose all waves you want to apply the function to in the DataBrowser. Now I assume that you want to subtract/divide each wave from/by itself, right?
Then try to use some code like this:

Function DoOperation()
    String dummy, ActWaveList="", ActWaveNames="", ActWaveName
    Variable pos, i, NumItems
   
    //creates a wave list from the browser selection
    do
        dummy=GetBrowserSelection(i)
        if (strlen(dummy)>0)
            ActWaveList+=dummy+";"
            pos=strsearch(dummy, ":",Inf,1)  //separates folders and wave
            ActWaveNames+=dummy[pos+1,strlen(dummy)-1]+";"
            i+=1
        else
            NumItems=i
            break
        endif
    while (1)

    //does the mathematical operation
    //the folder that contains the wave(s) has to be activated
    for(i=0;i<NumItems;i+=1)
        ActWaveName=StringFromList(i,ActWaveNames)
        Wave ActWave=$ActWaveName  //gives IGOR each wave stored in WaveList
        String ActWave_op=ActWaveName+"_op"+num2str(i)  //name of the new wave
        Duplicate/O ActWave, $ActWave_op  //new wave with the name 'ActWaveName+"_op"+num2str(i)'  is generated in the data folder
        Wave OpWave=$ActWave_op  //gives IGOR the wave
        OpWave[]=(ActWave[p]-ActWave[1])/ActWave[1]
    endfor
End


Hope this helps!
Marty

July 26, 2013 at 09:25 am - Permalink

Here is a simple example using a modular approach. It operates in the current data folder. You may be able to modify it for your purpose.

Function AddOneToWave(w)
    Wave w

    w += 1
End

Function AddOneToWavesInList(list)
    String list

    Variable numItems = ItemsInList(list)
    Variable i
    for(i=0; i<numItems; i+=1)
        String name = StringFromList(i, list)
        Wave w = $name
        AddOneToWave(w)
    endfor
End

Function Setup()
    Make/O/N=10 wave0=p, wave1=p+1, wave2=p+2
    Edit wave0, wave1, wave2
End

Function Demo()
    String list = WaveList("*", ";", "")        // list = "wave0;wave1;wave2;"
    AddOneToWavesInList(list)
End


Execute Setup() once from the command line. Then execute Demo().

July 26, 2013 at 10:57 am - Permalink