[R] using "dcast" function ?

[Ulrik Stervbo]

It is correct and will produce a data.frame. But I guess the result is not
what you intend since the resulting data.frame nothing but NA and Samples
in the diagonal:

df1 <- data.frame(x = letters[1:5], y = letters[6:10])
reshape2::dcast(df1, x ~ y)

You are missing values somewhere. If you want all possible combinations of
Cancer_Gene and Sample, look at expand.grid:

expand.grid(df1)

HTH
Ulrik

On Fri, 26 May 2017 at 11:26 Bogdan Tanasa <tanasa at gmail.com> wrote:

> Dear all, I would like to double-check with you please the use of "acast"
> or "dcast" function from "reshape2"package.
>
> I am starting with a data frame Y of GENES and SAMPLES,eg :
>
>   Cancer_Gene     Sample
> 1        ABL2  WT_10T
> 2        ABL2   WT_6T
> 3      ADGRA2   HB_8R
> 4        AFF4 EWS_13R
>
> and I would like to have a dataframe/matrix of CANCER_GENES * SAMPLES.
>
> Shall I do " dcast(Y, Cancer_Gene ~ Sample)", would it be correct ? thank
> you !
>
> -- bogdan
>
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>
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