>>>>> "EW" == Edward Wijaya <[EMAIL PROTECTED]> >>>>> on Wed, 21 May 2008 11:52:17 +0900 writes:
EW> Hi Peter, EW> Thanks. EW> as.matrix() does the trick. and ... again my perennial remark to the above "trick" : Do use data.matrix(dd) instead of as.matrix(dd) if dd is a data frame ... it will also produce a numeric matrix when dd contains factor (and similar) columns. Martin Maechler, ETH Zurich EW> - Edward EW> On Wed, May 21, 2008 at 11:31 AM, Peter Alspach EW> <[EMAIL PROTECTED]> 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: [EMAIL PROTECTED] >>> [mailto:[EMAIL PROTECTED] On Behalf Of Edward Wijaya >>> Sent: Wednesday, 21 May 2008 2:17 p.m. >>> To: r-help@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@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. >> EW> ______________________________________________ EW> R-help@r-project.org mailing list EW> https://stat.ethz.ch/mailman/listinfo/r-help EW> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html EW> and provide commented, minimal, self-contained, reproducible code. ______________________________________________ R-help@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.