Re: [R] Creating a Hash from Data.Frame

From: jim holtman <jholtman_at_gmail.com>
Date: Sun, 15 Jun 2008 22:03:19 -0400

here is a way:

> x <- read.table(textConnection("#GDS_ID GENE_NAME GENE_DESCRIPTION GENE_FUNCTION
+ 1007_s_at | DDR1 | discoidin domain receptor tyrosine kinase 1 | protein-coding
+ 1053_at | RFC2 | replication factor C (activator 1) 2, 40kDa | protein-coding + 117_at | HSPA6 | heat shock 70kDa protein 6 (HSP70B') | protein-coding"), sep="|",
+ strip.white=TRUE, quote='') # you need strip.white on the call
> closeAllConnections()
> str(x)
'data.frame': 3 obs. of 4 variables:

 $ V1: Factor w/ 3 levels "1007_s_at","1053_at",..: 1 2 3
 $ V2: Factor w/ 3 levels "DDR1","HSPA6",..: 1 3 2
 $ V3: Factor w/ 3 levels "discoidin domain receptor tyrosine kinase
1",..: 1 3 2
 $ V4: Factor w/ 1 level "protein-coding": 1 1 1
> x
         V1    V2                                          V3             V4
1 1007_s_at  DDR1 discoidin domain receptor tyrosine kinase 1 protein-coding
2   1053_at  RFC2 replication factor C (activator 1) 2, 40kDa protein-coding
3    117_at HSPA6        heat shock 70kDa protein 6 (HSP70B') protein-coding

> mydata <- character()
> mydata[as.character(x$V2)] <- as.character(x$V3)
> mydata["RFC2"] #access the data
                                         RFC2
"replication factor C (activator 1) 2, 40kDa"
>

remember to add the 'strip.white=TRUE' on read.table

On Sun, Jun 15, 2008 at 9:53 PM, Gundala Viswanath <gundalav_at_gmail.com> wrote:
> Hi,
>
> I have the following data frame:
>
>> print(mydatframe)
>
> __DATAFRAME__
>
> V1 V2 V3
> 1 1007_s_at DDR1 discoidin domain receptor tyrosine kinase 1
> 2 1053_at RFC2 replication factor C (activator 1) 2, 40kDa
> 3 117_at HSPA6 heat shock 70kDa protein 6 (HSP70B')
>
> __END__
>
> Is there a way to create a hash with
> V2 as Key and V3 as its value?
>
> - Gundala Viswanath
> Jakarta - Indonesia
>
> ______________________________________________
> R-help_at_r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem you are trying to solve?

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Received on Mon 16 Jun 2008 - 02:10:40 GMT

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