[R] Converting Data Types

[Peter Alspach]

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
> 
> ______________________________________________
> 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.
> 

The contents of this e-mail are privileged and/or confidential to the named
 recipient and are not to be used by any other person and/or organisation.
 If you have received this e-mail in error, please notify the sender and delete
 all material pertaining to this e-mail.