comp.lang.idl-pvwave archive: archive » Re: Oh what is wrong with WHERE() ?

Home » Public Forums » archive » Re: Oh what is wrong with WHERE() ?

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: Oh what is wrong with WHERE() ? [message #48562]

Mon, 01 May 2006 10:02

news.qwest.net
Messages: 137
Registered: September 2005

Senior Member

"Sheldon" <shejo284@gmail.com> wrote in message
news:1146327351.938523.112920@e56g2000cwe.googlegroups.com.. .
> Hi Bob,

> IF count_m GE count_p THEN nodata_tot = nodata_m ELSE nodata_tot =
> nodata_p
> The results showed that these two amounts were identical:
> 1443953
> 1443953

Just a thought:

Even though the total is equal, it may be that notdata_m is not
exactly equal to nodata_p.
A short example of what I mean.
p = [0,1,0]
m = [1,0,0]

nodata_p = (where p eq 1, count_p)
nodata_m = (where m eq 1, count_m)
IF count_m GE count_p THEN nodata_tot = nodata_m ELSE nodata_tot =
nodata_p

p[nodata_tot] = 1
m[nodata_tot] = 1

so your results are now:
p = [1,1,0]
m = [1,0,0]

(Hence the missing pixel in p is due to the fact that your 'p' had
a '1' in a place outside of 'nodata_tot'.)

Cheers,
bob

Report message to a moderator

[Message index]

		Re: Oh what is wrong with WHERE() ? By: news.qwest.net on Mon, 01 May 2006 10:02
		Re: Oh what is wrong with WHERE() ? By: Liberum on Sat, 29 April 2006 09:15
		Re: Oh what is wrong with WHERE() ? By: news.qwest.net on Sat, 29 April 2006 08:49
		Re: Oh what is wrong with WHERE() ? By: Liberum on Sat, 29 April 2006 08:35
		Re: Oh what is wrong with WHERE() ? By: David Fanning on Sat, 29 April 2006 08:14
		Re: Oh what is wrong with WHERE() ? By: Liberum on Thu, 04 May 2006 01:18

Previous Topic:	Re: Problem with for-slope
Next Topic:	Grid file manipulation (.grd)

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Mon Dec 01 12:49:27 PST 2025

Total time taken to generate the page: 1.11947 seconds