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Re: 2 arrays, average, missing data [message #45415 is a reply to message #45414]

Thu, 08 September 2005 07:53

R.G. Stockwell
Messages: 363
Registered: July 1999

Senior Member

"KJM" <kimberlite@gmail.com> wrote in message
news:1126189124.079832.197820@f14g2000cwb.googlegroups.com.. .
> HI All,
...
> If A = 0, C = B
> If B = 0, C = A
> If A and B EQ 0, C = 0
> If A and B NE 0, C = (A+B)/2
> Any help appreciated!
> Thanks.

Hi,
something along the lines of

gooddata = a*b
c = dblarr(n_elements(a))
zeros = where(gooddata eq 0,count,complement = nonzeros)
if count gt 0 then begin
c[nonzeros] = (a[nonzeros]+b[nonzeros])/2
c[zeros] = a[zeros] > b[zeros]
endif

NOTE: this assumes the values are greater than zero.
If they are not, then using zeros as the "bad value" may cause some
problems.

Cheers,
bob

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[Message index]

		Re: 2 arrays, average, missing data By: James Kuyper on Thu, 08 September 2005 10:31
		Re: 2 arrays, average, missing data By: kimberlite on Thu, 08 September 2005 08:46
		Re: 2 arrays, average, missing data By: Benjamin Luethi on Thu, 08 September 2005 08:24
		Re: 2 arrays, average, missing data By: Craig Markwardt on Thu, 08 September 2005 07:55
		Re: 2 arrays, average, missing data By: R.G. Stockwell on Thu, 08 September 2005 07:53
		Re: 2 arrays, average, missing data By: David Fanning on Thu, 08 September 2005 07:38

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