R help - May 2008 - 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

Hi Mark,

Doesn't seem to work.

x <- unclass(samples)
print (x)


It prints this instead

$V1
[1] 103.9

$V2
[1] 88.5

$V3
[1] 242.9

$V4
[1] 206.6

$V5
[1] 175.7

$V6
[1] 164.4

attr(,"row.names")
[1] 1

And it gives the same error for dgamma function.

- Edward

On Wed, May 21, 2008 at 11:22 AM,  <markleeds at verizon.net>
wrote:
>  unclass or should work , I think. so
>
> nonames<-unclass(samples)
>
>
>
> On Tue, May 20, 2008 at 10:16 PM, Edward Wijaya wrote:
>
>> 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.
>

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.
> 
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