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Re: Is there a standard 'null' array? [message #34593 is a reply to message #34590]

Mon, 31 March 2003 00:40

marc schellens[1]
Messages: 183
Registered: January 2000

Senior Member

> P.S. There was talk of adding a zero-length-array type a few years
> ago, but the consensus was that it's probably too late to fit it
> easily into a 25 year old program.

So what? If its now introduced, old code would not have to change.

I don't know Matt's actual need, but another simple method I
use for small arrays is just to set the first element and later
delete it. The code looks nicer than with this if n_elements()...
and for less than somthing 100 elements (and not deep inside some loops)
its fine (even quicker than with if n_elements() within the loop):

vec=0
for i=0,cowscomehome do begin
if some_test then do vec=[vec,complicated_function(i)]
endfor
if n_elements(vec) gt 1 then vec=[1:*] else tmp=temporary(vec)

cheers,
marc

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[Message index]

		Re: Is there a standard 'null' array? By: JD Smith on Tue, 01 April 2003 11:55
		Re: Is there a standard 'null' array? By: James Kuyper on Tue, 01 April 2003 10:52
		Re: Is there a standard 'null' array? By: JD Smith on Tue, 01 April 2003 10:18
		Re: Is there a standard 'null' array? By: JD Smith on Tue, 01 April 2003 10:17
		Re: Is there a standard 'null' array? By: Matt Feinstein on Tue, 01 April 2003 09:20
		Re: Is there a standard 'null' array? By: JD Smith on Mon, 31 March 2003 08:15
		Re: Is there a standard 'null' array? By: marc schellens[1] on Mon, 31 March 2003 00:40
		Re: Is there a standard 'null' array? By: JD Smith on Fri, 28 March 2003 08:32

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