Re: [R] Converting Data Types

From: Peter Alspach <PAlspach_at_hortresearch.co.nz>
Date: Wed, 21 May 2008 14:31:24 +1200

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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> http://www.R-project.org/posting-guide.html
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>

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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. Received on Wed 21 May 2008 - 02:36:52 GMT

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