Dividing all waves in a folder by a value

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Thu, 12/15/2022 - 06:30 am

Hi guys, 

I have a problem, which might be very easy to solve. I have a folder with waves and I want to divide all waves by the factor 1000 using the following function:

 

Function NormalizeAll()

Variable n=ItemsInList(wavelist("*",";",""))

Variable i

	For (i=0; i<=n; i+=1)

		$(StringfromList(i,wavelist("*",";","")))=$(StringfromList(i,wavelist("*",";","")))/1000		

   EndFor

End

 

The error is: "Can't use $ in this way in a function". I am confused, because I have used the $-trick in a function before. If I put the line in the for loop in the commander for a specific value of i, it works. Thank you for your help!

You have to declare the wave first

Function NormalizeAll()

Variable n=ItemsInList(wavelist("*",";",""))

Variable i

    For (i=0; i<=n; i+=1)

        Wave MyWave=$(StringfromList(i,wavelist("*",";","")))
        MyWave=MyWave/1000     

   EndFor

End

 

December 15, 2022 at 06:36 am - Permalink

For your curiosity here is another way of accomplishing the same thing with different commands

Function MyFunction()

    //  The datafolder to look for waves in
    DFREF MyFolder=root:MyFolder
   
    //  Checks that the datafolder exists
    If ((DataFolderRefStatus(MyFolder)!=0)

        //  Counts the number of waves in the folder
        //  (If you have non-numeric waves in the folder you will have to add additional checks for that)
        Variable n=CountObjectsDFR(MyFolder, 1)

        //  Creates a list of all waves in the folder
        Make/FREE/O/WAVE/N=(n) AllWaves=WaveRefIndexedDFR(MyFolder, p)
       
        //  Multithreads dividing the waves by 1000
        MultiThread AllWaves[]=DoStuffToWave(AllWaves[p])
    endif
end


       
ThreadSafe Function/WAVE DoStuffToWave(MyWave)
//  Divides the waves by 1000. Uses FastOP for speed increase
Wave MyWave
    FastOP MyWave=(1/1000)*MyWave
    Return MyWave
end

 

December 15, 2022 at 08:35 am - Permalink

Hi,

Depending on how often you need the command, don't forget the ability to execute a command in the data browser.

Select all the waves of interest and then in the execute command dialog:

%s /=1000

Andy

December 15, 2022 at 08:46 am - Permalink