Comments on: The hash package: hashes come to R http://opendatagroup.com/2009/07/26/hash-package-for-r/ Open Data Group's Home Page and Blog Thu, 12 Aug 2010 19:48:26 -0500 http://wordpress.org/?v=2.8.6 hourly 1 By: esther http://opendatagroup.com/2009/07/26/hash-package-for-r/comment-page-1/#comment-631 esther Thu, 12 Aug 2010 19:48:26 +0000 http://blog.opendatagroup.com/?p=91#comment-631 Brilliant package! Took me a few hours to get my head round - but here's the line of code I've come up with - I needed to add a 'gender' - column to my data. It works and it's VERY fast! relevant_records["gender"] <- ifelse( has.key(as.character(relevant_records$participant_id),female_hash), "female", "male" ) Thanks! Esther :-) Brilliant package! Took me a few hours to get my head round – but here’s the line of code I’ve come up with – I needed to add a ‘gender’ – column to my data. It works and it’s VERY fast!

relevant_records["gender"] <- ifelse( has.key(as.character(relevant_records$participant_id),female_hash), "female", "male" )

Thanks!

Esther :-)

]]> By: Gabor http://opendatagroup.com/2009/07/26/hash-package-for-r/comment-page-1/#comment-614 Gabor Mon, 12 Jul 2010 22:33:34 +0000 http://blog.opendatagroup.com/?p=91#comment-614 Explicitly forcing i to a string using toString() solves this problem. Explicitly forcing i to a string using toString() solves this problem.

]]> By: Gabor http://opendatagroup.com/2009/07/26/hash-package-for-r/comment-page-1/#comment-613 Gabor Sun, 11 Jul 2010 01:19:38 +0000 http://blog.opendatagroup.com/?p=91#comment-613 I had an R function that worked until I updated R and some packages to latest versions. Now I am getting the following problem when I assign to some hashes. Error in assign(i, value, x@.xData) : invalid first argument The following code will produce this. RIs <- hash(1,1:100) RI <- rnorm(100,mean=.5,sd=.05) i=1 RIs[[i]] <- RI Please help. I had an R function that worked until I updated R and some packages to latest versions. Now I am getting the following problem when I assign to some hashes.

Error in assign(i, value, x@.xData) : invalid first argument

The following code will produce this.

RIs <- hash(1,1:100)
RI <- rnorm(100,mean=.5,sd=.05)
i=1
RIs[[i]] <- RI

Please help.

]]> By: christopher http://opendatagroup.com/2009/07/26/hash-package-for-r/comment-page-1/#comment-562 christopher Sun, 25 Apr 2010 11:11:39 +0000 http://blog.opendatagroup.com/?p=91#comment-562 Ivo, Yes. There was a problem with an earlier implementation of the package in which performance was poor on large hashes. This has been fixed. The 'has.key' method is an S4 method for testing whether the key is assigned to the hash. Ivo,

Yes. There was a problem with an earlier implementation of the package in which performance was poor on large hashes. This has been fixed.

The ‘has.key’ method is an S4 method for testing whether the key is assigned to the hash.

]]> By: christopher http://opendatagroup.com/2009/07/26/hash-package-for-r/comment-page-1/#comment-561 christopher Sun, 25 Apr 2010 10:58:50 +0000 http://blog.opendatagroup.com/?p=91#comment-561 Carlo, There preferred way to do many value look-ups is use the 'values' function that takes an optional 'keys' argument. Chris Carlo,

There preferred way to do many value look-ups is use the ‘values’ function that takes an optional ‘keys’ argument.

Chris

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