How to select one of 24 numbered waves: wave0, wave1.....wave23

A good way to organize your data sets is to load each dataset (wave0..wave23) into a separate data folder. If you are not familiar with data folders, execute:

DisplayHelpTopic "Data Folders"

The way to address waves in a loop is to use the $ operator to create a wave reference from a string containing a wave name. If you are not familiar with wave references, execute:

DisplayHelpTopic "Wave References"

and

DisplayHelpTopic "Accessing Global Variables And Waves"

Here is an example that creates two datasets, each in its own data folder, and then creates a third data folder containing difference waves:

Function MakeDemoWaves(int n)
	String name
	int i

	// Make n demo waves in data folder dfA
	NewDataFolder/O/S dfA
	for(i=0; i<n; i+=1)
		sprintf name, "wave%d", i
		Make/O $name = i + p
	endfor
	SetDataFolder ::

	// Make n demo waves in data folder dfB
	NewDataFolder/O/S dfB
	for(i=0; i<n; i+=1)
		sprintf name, "wave%d", i
		Make/O $name = i + p
	endfor
	SetDataFolder ::
End


// Example:
//	MakeDemoWaves(3)
//	DemoDifWaves(3, dfA, dfB)
Function DemoDifWaves(int n, DFREF dfA, DFREF dfB)
	String name
	int i

	NewDataFolder/O dfDif
	DFREF dfDif = :dfDif
	
	// Create difference waves in current data folder
	for(i=0; i<n; i+=1)
		sprintf name, "wave%d", i
		WAVE aWave = dfA:$name
		WAVE bWave = dfA:$name
		
		String difName
		sprintf difName, "difAB_%d", i
		Duplicate/O aWave, dfDif:$difName
		WAVE difWave = dfDif:$difName
		
		difWave = bWave - aWave	
	endfor
End

Thanks a lot for this demo, After getting familiarised with datafolders I successfully could solve my problem using this template.