Home Forums Code snippets Sum of a wave in the output_1 selection group

This topic contains 2 replies, has 2 voices, and was last updated by  Katharina Halbach 1 year, 3 months ago.

  • Creator
  • #7850

    Katharina Halbach

    Hello iolite-team,

    I would like to know how to refer to a channel just for the output integration time. I was trying to print the sum of a channel. However, it returns the sum including the standard. I only want the sum for my output.

    Thanks for your help!

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  • Author
  • #7983

    Dr Bence Paul

    Hi Katharina,

    Sorry for taking so long to reply. I have just returned from leave, and it took a little coding to produce what you’re after. To return the sum of values in a channel only for your samples requires to you make selections within a selection group. For example, if you wanted the sum of all values for your samples for the channel Na23, you would put your selections for your samples in Output_1. Then you would sum all the values that occur during the time intervals defined by the selections. We have some code to return the avg and 2SD/2SE, but I had to alter our code to return the sum. Below is some code that you can copy and paste into a procedure window in Igor Pro (Windows -> Procedure Window). You can then type into the Command Window (Cmd + H, Ctrl + H on PC):

    print ExtractIntegTypeValuesOnly(“Output_1”, “Na23”, “sum”)

    As described above, this will print the sum of all values in channel Na23 within the time defined by selections in Output_1.

    Please note that this bit of code should be included with the next release of iolite, so you won’t have to copy and past the code below when it is released.

    Please let us know if you have any troubles.

    Best regards,

    //This function extracts the mean value, sum or standard deviations of a particular selection group and returns it as a number		
    Function ExtractIntegTypeValuesOnly(Integ_Name,Wave_Name,Mode)
    	String Integ_Name		//Name of Integration, e.g. Baseline_1
    	String Wave_Name		//This is the Name of the wave that the function will return stats for
    	String Mode				//Set to "Avg" to return the average, set to "2sd" to return 2 standard deviations, "2SE" to return 2 standard error, "sum" to return sum of all selections
    	String DatafolderName = WhereIsWave(Wave_Name)	//This is the data folder to look for the wave in
    	wave YAxisSource = $ioliteDFpath(DatafolderName,Wave_Name)	//Now we can reference the wave
    	//the next 5 lines reference all of the global strings and variables in the header of this file for use in the main code of the DRS that follows.
    	string currentdatafolder = GetDataFolder(1)
    	setdatafolder $ioliteDFpath("DRSGlobals","")
    	SVar IndexChannel, ReferenceStandard, DefaultIntensityUnits
    	NVar MaskThreshold, MaskEdgeDiscardSeconds
    	setdatafolder $ioliteDFpath("Temp","")
    	wave SourceMatrix = $IoliteDFpath("integration","m_" + Integ_Name)
    		PrintAbort ("Could not find the integration matrix selected. Process has been aborted.")
    	wave Index_time = $IoliteDFpath("CurrentDRS","Index_Time")
    		PrintAbort ("Could not find Index Time in CurrentDRS folder. Process has been aborted.")
    	variable thisinteg=0, NoOfIntegs=dimsize(SourceMatrix,0) 
    	variable thisstartpoint,thisendpoint,thisstarttime,thisendtime // per-integration start and end points and times
    	wave StdSegments = $MakeIoliteWave("temp",Wave_Name+"_m",N = 0)	//Create a temporary wave with no points in it to hold all the values. Don't worry, points will be added during the loop
    	StdSegments = NaN
    	Variable NoOfPoints		//This is the number of points in each integration
    	Variable RowNumber		//This is the row number of the last entry in the StdSegments wave, where we'll add the points
    	Do //loop through the integrations of the standard integration and make a separate wave for each one
    		if(thisinteg>NoOfIntegs-1) //if there are no integrations left
    			break //then break the loop
    		thisstarttime=SourceMatrix[thisinteg][0][%$"Median Time"]-SourceMatrix[thisinteg][0][%$"Time Range"]//get start, and
    		thisendtime=SourceMatrix[thisinteg][0][%$"Median Time"]+SourceMatrix[thisinteg][0][%$"Time Range"]//end times for this integration
    		thisstartpoint=ForBinarySearch(index_time, thisstarttime)
    		thisendpoint=ForBinarySearch(index_time, thisendtime) //find point indices for requested start and end points
    		if(thisstartpoint==thisendpoint) //if start and end points the same, then both times precede or postdate entire wave, wave is only 0 points long, or start and end times do not bracket any point in the wave.
    			thisinteg+=1 //set pointer to next sample
    			continue //and return to start of loop
    		endif //otherwise, have bracketed at least a single point
    		Duplicate/O/R=[thisstartpoint,thisendpoint] YAxisSource temporyExtract		//Copy the values out of the source wave into a temporary wave
    		Duplicate/O StdSegments TempOrig		//Can't concatenate two waves into one, muct concatenate two waves into a new wave, so we create a temporary copy of the original, then concentate that with the new data
    		Wave temporyExtract, TempOrig
    		Concatenate/NP/O "TempOrig;temporyExtract;", StdSegments	//Then join the two together
    		thisinteg+=1 //next integration
    	while(thisinteg<NoOfIntegs) //until all integrations added
    	Variable ReturnValue
    	If (cmpstr(Mode, "avg", 0)==0)
    		Wavestats/Q /M=1 StdSegments
    		SetDataFolder currentdatafolder
    		Return ReturnValue
    	ElseIf(cmpstr(Mode, "2sd", 0)==0)
    		Wavestats/Q  StdSegments
    		ReturnValue = 2 * V_sdev
    		SetDataFolder currentdatafolder
    		Return ReturnValue
    	ElseIf(cmpstr(Mode, "2se", 0)==0)
    		Wavestats/Q  StdSegments
    		ReturnValue = 2 * V_sdev / sqrt(V_npnts)
    		SetDataFolder currentdatafolder
    		Return ReturnValue
    	ElseIf(cmpstr(Mode, "sum", 0)==0)
    		Wavestats/Q  StdSegments
    		ReturnValue = V_sum
    		SetDataFolder currentdatafolder
    		Return ReturnValue

    Katharina Halbach

    Thanks Bence, it’s working nicely!

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