Comparison Operator

OK, regexpr gets me what I needed, thanks to all..

One more thing, say I have a Table like:

0 RAW1 RAW2 RAW3 AVE1 AVE2 AVE3
1   1   2    5    2.3  1.2  4.5
2   0   3    6    1.7  2.2  3.5
3   3   1    6    0.1  3.9  1.6


and I want to create a sub table that only has the RAW columns.
Problem is I won't know what the column names will be, only that
they either contain "RAW" or "AVE" and they may not be grouped
together.

Mike


-----Original Message-----
From: Don MacQueen [mailto:macq at llnl.gov]
Sent: Friday, May 30, 2003 8:48 AM
To: Dirk Eddelbuettel; mhoward
Cc: r-help at stat.math.ethz.ch
Subject: Re: [R] Comparison Operator


grep() by itself isn't quite right for this job:

  a<-"Is a Fish"
  b<-"aFish"
  if (grep(b,a)) c<-TRUE

Error in if (grep(b, a)) c <- TRUE : argument is of length zero

-Don

On Thu, May 29, 2003 at 05:11:24PM -0600, mhoward at micron.com wrote:

 Does R have a comparison operator similar to the Like function, for example:

 a<-"Is a Fish"
 b<-"Fish"

 if(b in a){c<-TRUE}

You probably want grep:

 > a<-"Is a Fish"
 b<-"Fish"
 if (grep(b,a)) c<-TRUE
 > c

[1] TRUE

Hth, Dirk

--
Don't drink and derive. Alcohol and analysis don't mix.

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--------------------------------------
Don MacQueen
Environmental Protection Department
Lawrence Livermore National Laboratory
Livermore, CA, USA