[R] Not able to convert data.frame to numeric properly

[arun]

Hi,
Try:
min(sapply(lapply(a,as.character),as.numeric)) 
#[1] 2.2194 


A.K.

On Wednesday, April 9, 2014 2:27 AM, Sachinthaka Abeywardana <sachin.abeywardana at gmail.com> wrote:

a is ofcourse a subset of data.frame, a ROW of the original table specifically.

> str(a)
'data.frame': 1 obs. of  4 variables:
$ GHP: Factor w/ 51 levels "0.0944","0.1446",..: 33
$ GP : Factor w/ 51 levels "0.1755","0.3582",..: 29
$ T  : num 2.9
$ Tn : num 3.3
> dput(a)
structure(list(GHP = structure(33L, .Label = c("0.0944", "0.1446",
"0.2", "0.4124", "0.7601", "0.871", "0.8849", "0.9176", "1.0168",
"1.0663", "1.0947", "1.1823", "1.1831", "1.2418", "1.2542", "1.3082",
"1.3283", "1.3758", "1.4437", "1.4621", "1.5769", "1.6699", "1.7306",
"1.8366", "1.8456", "1.8651", "1.8972", "1.9595", "2.0781", "2.0802",
"2.1553", "2.2097", "2.2194", "2.3669", "2.3935", "2.5351", "2.5374",
"2.5966", "2.6934", "2.7764", "2.9073", "6.003", "6.0825", "6.1013",
"6.1068", "6.1675", "6.2401", "6.6001", "6.6047", "7.8665", "+AC0-27.0565"
), class = "factor"), GP = structure(29L, .Label = c("0.1755",
"0.3582", "0.4155", "0.4208", "0.7388", "0.8394", "0.8853", "0.9254",
"0.9423", "0.9695", "0.9757", "0.9793", "0.9896", "1.0422", "1.0519",
"1.116", "1.2482", "1.2691", "1.2735", "1.2788", "1.2948", "1.3141",
"1.3204", "1.4006", "1.5333", "1.6157", "1.9003", "2.6024", "2.6561",
"2.7466", "2.7572", "2.8108", "2.8256", "2.9565", "2.978", "3.0665",
"3.1155", "3.2027", "3.2123", "3.257", "3.4055", "6.0616", "6.0671",
"6.1166", "6.2053", "6.592", "6.6734", "7.005", "7.3159", "8.5777",
"+AC0-20.3347"), class = "factor"), T = 2.9007, Tn = 3.2988), .Names = c("GHP",
"GP", "T", "Tn"), row.names = 28L, class = "data.frame")


On Wed, Apr 9, 2014 at 4:17 PM, Frede Aakmann Tøgersen <frtog at vestas.com> wrote:
> We can't say because we don't know how a was created.
>
> Please email the output from
>
> str(a)
>
> and
>
> dput(a)
>
>
>
> Yours sincerely / Med venlig hilsen
>
>
> Frede Aakmann Tøgersen
> Specialist, M.Sc., Ph.D.
> Plant Performance & Modeling
>
> Technology & Service Solutions
> T +45 9730 5135
> M +45 2547 6050
> frtog at vestas.com
> http://www.vestas.com
>
> Company reg. name: Vestas Wind Systems A/S
> This e-mail is subject to our e-mail disclaimer statement.
> Please refer to www.vestas.com/legal/notice
> If you have received this e-mail in error please contact the sender.
>
>
>> -----Original Message-----
>> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
>> On Behalf Of Sachinthaka Abeywardana
>> Sent: 9. april 2014 08:11
>> To: r-help at r-project.org
>> Subject: [R] Not able to convert data.frame to numeric properly
>>
>> I have the following:
>>
>>
>> >a #note that the 28 is a row.name
>>
>>         GHP     GP      T     Tn
>> 28   2.2194 2.6561 2.9007 3.2988
>>
>> >min(as.numeric(a))
>> 2.9007
>> >min(as.numeric(as.character(a)))
>> 2.9007
>> >as.numeric(as.character(a))                 #What's going on here???
>> [1] 33.0000 29.0000  2.9007  3.2988
>>
>> So basically how do I get this to show the correct value of 2.21 as my
>> minimum value?
>>
>> Thanks,
>> Sachin
>>
>> ______________________________________________
>> 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.

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