Date: Tue, 13 Oct 2009 06:59:33 -0500
Reply-To: "Data _null_;" <iebupdte@GMAIL.COM>
Sender: "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From: "Data _null_;" <iebupdte@GMAIL.COM>
Subject: Re: Determining if a character string includes a phrase
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It is "double NOT" used to normalize the position to a "boolean".
boolean = NOT NOT indexW(.....);
On 10/13/09, Jack Clark <email@example.com> wrote:
> Will you explain the double caret operator from your solution below? I
> see that it is returning a 1 or 0 instead of the position in the string
> normally returned by INDEXW, but I am not familiar with the operator.
> Thank you,
> Jack Clark
> Senior Research Analyst
> phone: 410-455-6256
> fax: 410-455-6850
> University of Maryland, Baltimore County
> Sondheim Hall, 3rd Floor
> 1000 Hilltop Circle
> Baltimore, MD 21250
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> From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU] On Behalf Of
> Paul Dorfman
> Sent: Tuesday, October 13, 2009 1:41 AM
> To: SAS-L@LISTSERV.UGA.EDU
> Subject: Re: Determining if a character string includes a phrase
> Frankly, I fail to see why it seems to be difficult. Both INDEXw and
> functions are suited for the task, e.g.:
> data _null_ ;
> input text $64. ;
> text = translate (text, " ", ".,") ;
> array pp $ 64 p1-p3 ("the train", "the station", "and i wasn't on
> it") ;
> array phrase  ;
> do over pp ;
> phrase[_i_] = ^^ indexw (upcase (text), upcase (strip (pp))) ;
> end ;
> put phrase[*] ;
> cards ;
> The train left the station, and I wasn't on it.
> I wasn't on it when the train left the station.
> The station was empty: the train had left without me.
> run ;
> A much more interesting and involved question would be what is the most
> efficient way to confirm or reject the presence or the phrase
> "the Raven still sitting above my door, his eyes all dreaming"
> "And the Raven, never flitting, still is sitting, still is sitting on
> pallid bust of Pallas just above my chamber door, and his eyes have all
> seeming of the demon that is dreaming".
> Any takers?
> Kind regards
> Paul Dorfman
> Jax, FL