Interpolate2 with free waves

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Hello,

I'm trying to use interpolate2 with free destination waves and I haven't been successful.

First, the base case:
- x destination and y destination are normal - works as expected
- x destination normal, y destination free - works as expected



function interpolatetest1()
	make/o/n=6 xsrc, ysrc
	make/o/n=12 xdest
	
	wave xsrc
	wave ysrc
	wave xdest

	xsrc = p
	ysrc = 2^p
	xdest = p*0.5
	interpolate2/i=3/x=xdest/y=ydest xsrc, ysrc
	print xdest
	print ydest
	
	make/free/n=12 ydestfree
	interpolate2/i=3/x=xdest/y=ydestfree xsrc, ysrc
	print xdest
	print ydestfree
end



Using free waves:
- x dest is free, y dest is normal
- x dest is free y dest is free

Both result in "Function Execution Error, While executing Interpolate2, the following error occurred. The x destination wave must be single or double precision floating point." I also believe that I have had a case where the error did not occur, but the y destination values were returned with non-zero values. However, I haven't been able to consistently replicate that case.



function interpolatetest2()
	make/o/n=6 xsrc, ysrc
	make/free/n=12 xdest
	
	wave xsrc
	wave ysrc
	
	xsrc = p
	ysrc = 2^p
	xdest = p*0.5
	interpolate2/i=3/x=xdest/y=ydest xsrc, ysrc
	print xdest
	print ydest
	
	make/free/n=12 ydestfree
	interpolate2/i=3/x=xdest/y=ydestfree xsrc, ysrc
	print xdest
	print ydestfree
end



Using normal waves in a free directory:
Again: "Function Execution Error, While executing Interpolate2, the following error occurred. The x destination wave must be single or double precision floating point."

function interpolatetest3()
make/o/n=6 xsrc, ysrc

wave xsrc
wave ysrc

xsrc = p
ysrc = 2^p

dfref dftemp = newfreedatafolder()
dfref dforig = getdatafolderdfr()
cd dftemp
make/n=12 xdest
wave xdest
cd dforig

xdest = p*0.5
interpolate2/i=3/x=xdest/y=ydest xsrc, ysrc
print xdest
print ydest

make/free/n=12 ydestfree
interpolate2/i=3/x=xdest/y=ydestfree xsrc, ysrc
print xdest
print ydestfree
end


I thought that in the past I'd figured out a way around this while continuing to use free waves, but for now, I'm just going to make normal waves and delete them when I'm done.

I'm using Win 8, Igor 6.3.1.2 32-bit. I've also observed this in several previous versions of Igor.

Thanks for any insight,
Henry
I believe that this was fixed in version 6.3.2. From the What's Changed File:
Interpolate2 now correctly handles free waves passed as X dest wave in "X from dest" mode (/I=3 flag). Also handles free waves passed as stdDevWave (/SWAV flag).


Choose Help->Updates for Igor to update your installation.

October 15, 2013 at 10:26 am - Permalink
Thank you! This one had been frustrating me for years! (Although I only now posted about it.)

Thanks again and my apologies for not checking the most recent release first.

Henry

October 15, 2013 at 12:55 pm - Permalink

Please excuse my resurrection of this very old discussion.

It seems that Interpolate2 is still fussy about mixtures of free and non-free waves as inputs and outputs. What are the rules for mixing free and normal waves? Should we expect Interpolate2 to work consistently for any mixture?

June 11, 2021 at 06:38 am - Permalink