Converting Data Types
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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