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Re: Succinct way of testing array membership [message #81298 is a reply to message #81203] Thu, 30 August 2012 14:12 Go to previous message
Helder Marchetto is currently offline  Helder Marchetto
Messages: 520
Registered: November 2011
Senior Member
On Thursday, August 30, 2012 7:09:35 PM UTC+2, Mike Galloy wrote:
> On 8/30/12 10:51 AM, godber wrote:
>
>> Is there a more succinct way of testing array membership than using where and n_elements on the indexes? Something like array_contains(a, 'pancakes')?
>
>>
>
>> Austin
>
>>
>
>
>
> In general, how about:
>
>
>
> print, where(a eq 'pancakes', /null) ? 'found' : 'not found'
>
>
>
> Mike
>
> --
>
> Michael Galloy
>
> www.michaelgalloy.com
>
> Modern IDL: A Guide to IDL Programming (http://modernidl.idldev.com)
>
> Research Mathematician
>
> Tech-X Corporation

Hi Mike,
I never noticed the presence of the /null keyword. Nice tip.
However, the version you provided will not work (at least not on my pc...).
How about:
print, (where(a EQ 'pancakes', /null) NE !NULL) ? 'found' : 'not found'
or
print, ((where(a EQ 'pancakes'))[0] GE 0) ? 'found' : 'not found'

Not as clean, but still doing the job.

Cheers,
Helder

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