[R] Converting Data Types

[Edward Wijaya]

Hi Peter,

Thanks.

as.matrix()  does the trick.

- Edward

On Wed, May 21, 2008 at 11:31 AM, Peter Alspach
<PAlspach at hortresearch.co.nz> wrote:
> Edward
>
> Are you sure mymatrix is, in fact, a matrix and note a dataframe (which
> is a list)?  I get:
>
>> is.matrix(mymatrix)
> [1] FALSE
>> is.data.frame(mymatrix)
> [1] TRUE
>> samples <- mymatrix[1,]
>> llgm <- dgamma(samples, scale=1, shape=2, log = TRUE)
> Error in dgamma(x, shape, scale, log) :
>  Non-numeric argument to mathematical function
>
> That is, the same error as you when mymatrix is a dataframe.  But
> convert it to a matrix and:
>
>> mymatrix <- as.matrix(mymatrix)
>> is.matrix(mymatrix)
> [1] TRUE
>> is.data.frame(mymatrix)
> [1] FALSE
>> samples <- mymatrix[1,]
>> llgm <- dgamma(samples, scale=1, shape=2, log = TRUE)
>> llgm
>        V1         V2         V3         V4         V5         V6
>  -99.25657  -84.01700 -237.40735 -201.26922 -170.53122 -159.29770
>
> HTH ....
>
> Peter Alspach
>
>
>> -----Original Message-----
>> From: r-help-bounces at r-project.org
>> [mailto:r-help-bounces at r-project.org] On Behalf Of Edward Wijaya
>> Sent: Wednesday, 21 May 2008 2:17 p.m.
>> To: r-help at r-project.org
>> Subject: [R] Converting Data Types
>>
>> Hi,
>>
>> How can I convert the matrices to list.
>>
>> For example I have this snippet:
>>
>> samples<-mymatrix[1,]
>> print(samples)
>>
>> which prints:
>>
>>      V1   V2    V3    V4    V5    V6
>> 1 103.9 88.5 242.9 206.6 175.7 164.4
>>
>>
>> How can I convert the object "samples" such that it prints:
>> [1] 103.9 88.5 242.9 206.6 175.7 164.4
>>
>> The reason I ask this because I can't use the former
>> "samples" object with this function:
>>
>> llgm <- dgamma(samples, scale=1, shape=2, log = TRUE)
>>
>> which gives this error:
>> e 1374Error in dgamma(x, shape, scale, log) :
>>   Non-numeric argument to mathematical function
>>
>> Regards,
>> Edward
>>
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