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Re: N_ELEMENTS and WHERE: Scalar or Array ? [message #14225 is a reply to message #14130]

Fri, 29 January 1999 00:00

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

rmlongfield@my-dejanews.com wrote:

> Hi All, I keep making the same mistake with N_ELEMENTS so I decided
> to write and ask if anyone has found a solution. I use WHERE to find some
> zeroes in a data set which I want to exclude in further processing. Problem
> is that sometimes they are all zeroes. Using a simple :
>
> non_zero_xvalues = WHERE (subarray1 GT 0)

You should use
non_zero_xvalues = WHERE (subarray1 GT 0,count_non_zero_xvalues)
if count_non_zero_xvalues ne 0 then begin
endif

>
> IF(non_zero_array EQ -1) ...

IF non_zero_array[0] EQ -1 ..

>
>
> gets me into trouble because, when it is an array, I get an error. If I use
> N_ELEMENTS(non_zero_array) there is always at least one element, whether it
> is -1 or something else. I don't like ignoring the 'something else' value
> just because it is the only one. Is the answer another IF statement or some
> sort of error control?
>

Regards
R.Bauer

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[Message index]

		N_ELEMENTS and WHERE: Scalar or Array ? By: rmlongfield on Fri, 29 January 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: davidf on Wed, 03 February 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: steinhh on Wed, 03 February 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: wmc on Wed, 03 February 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: wmc on Wed, 03 February 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: Jack Saba on Tue, 02 February 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: steinhh on Tue, 02 February 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: Craig Markwardt on Mon, 01 February 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: wmc on Mon, 01 February 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: steinhh on Mon, 01 February 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: wmc on Mon, 01 February 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: Mark Buckley on Fri, 29 January 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: davidf on Fri, 29 January 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: David Ritscher on Fri, 29 January 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: David Kastrup on Fri, 29 January 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: R.Bauer on Fri, 29 January 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: David Ritscher on Thu, 04 February 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: Michael Werger on Thu, 04 February 1999 00:00
		Re: N_ELEMENTS and WHERE: Scalar or Array ? By: Annette Schloss on Wed, 03 February 1999 00:00

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