On Mon, Jun 13, 2011 at 11:06 AM, Aparna <aparna.sampat...@gmail.com> wrote:
> Hi All
>
> I am new to R and I am not sure of how this should be done. I have a matrix
> of
> 985x100 values and the class is data.frame.
You don't have a 'matrix' in the R sense of the word. You seem to
have a table of numbers which are stored in an object of class
'data.frame'.
> V2 V3 V4 V5 V6
> 2 0.009953966 -0.01586103 -0.016227028 0.016774711 -0.021342598
> 3 -0.230181145 0.203303786 -0.685321843 0.147050709 -0.122269004
> 4 -0.552905273 -0.034039644 -0.511356309 -0.330524909 -0.239088566
> 5 -0.089739322 -0.082768643 -0.411209134 -0.301011664 1.560185991
> 6 -1.986059137 -0.252217616 -0.369044526 -0.585619405 0.545903757
> 7 -1.635875161 2.741310455 -0.058411313 -1.458825827 0.078480977
> 8 0.525846706 -1.134643662 -0.067014844 -1.431990219 -0.557057121
> 9 -0.913511821 0.688374777 0.376412044 -0.861746434 2.065507172
> 10 -1.538179621 0.814330376 1.639939042 -1.41478931 1.802738289
> 11 0.817957993 -0.426560507 2.773380242 -0.123291817 1.316883748
>
>
> When I try to use this command to convert it to numeric,
A data frame doesn't have an overall sense of itself being numeric or
character. Only the columns have that, and they can be independent.
> as.numeric(leu_cluster1): I get an error Error: (list) object cannot be
> coerced
> to type 'double'.
Because a data frame is implemented as a list where each element is
the same length. Each element is a vector of numbers or characters.
You are doing the equivalent of:
as.numeric(list(foo=c(1,2,3))
now you may think it reasonable to do an 'as.numeric' on that, but what about:
as.numeric(list(foo=list(bar=c(1,2,3),baz=c(34,5)),bar=c("Hello","World"))
how would you 'as.numeric' that?
> I tried several functions and looked into other forums too,
> but could not find a solution. i am trying to change it to numeric data.frame
> and not to a matrix.
There is no numeric data frame. There is only numeric matrix, or a
dataframe with all numeric columns. Do summary(mydataframe) to see
what class your columns all are.
Barry
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