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Determing Range of a set of values

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AndrewWright July 30, 2010 - 13:16
Posts: 6
 Joined: 2010-07-30
 Location: United States

I would like to have a function "range(waveName [, x1,x2])" that emulates the mean function, but would return the difference between the highest and lowest values in the specified set.
Igor
 July 30, 2010 - 14:07
Igor's picture
Posts: 335
 Joined: 2007-06-29
 Location: United States

How about:

Function myRange(inWave,x1,x2)
	Wave inWave
	Variable x1, x2
 
	WaveStats/M=1/Q/R=(x1,x2) inWave
	return V_max-V_min
End
hrodstein
 July 30, 2010 - 17:00
Posts: 906
 Joined: 2007-06-21
 Location: United States

How about:

Function RangeDif(w, x1, x2)
	Wave w
	Variable x1, x2
 
	Variable wMin = WaveMin(w, x1, x2)
	Variable wMax = WaveMax(w, x1, x2)
	Variable dif = wMax - wMin
 
	return dif
End

I'm not sure which would be faster (and I'm not willing to bet a nickel on it!).
AndrewWright August 3, 2010 - 05:07
Posts: 6
 Joined: 2010-07-30
 Location: United States

Thanks to both!

I was embedding the function into a routine found in the manual "Finding the Mean of Segments of a Wave," using "range" instead of "mean."

It ended up that working with the WaveMax and WaveMin valuations was the easier way to go. I tried to create a value "y_range" separately, but it wasn't taking for whatever reason. Anyway, I got what I needed.
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