[R] Finding a Diff within a Dataframe columns

[Santosh Srinivas]

Please take a look at the introduction to R too ...

> df <- read.delim(textConnection(Lines),sep="")
> df
    A   B   C    D
1 0.1 0.7 0.9 0.80
2 0.2 0.6 0.8 0.70
3 0.4 0.8 0.7 0.76
> d['A-B'] <- with(df, A-B)
Error in d["A-B"] <- with(df, A - B) : object 'd' not found
> d$v1 <- with(df, A-B)
Error in d$v1 <- with(df, A - B) : object 'd' not found
> d
Error: object 'd' not found
> df$v1 <- with(df, A-B)
> df
    A   B   C    D   v1
1 0.1 0.7 0.9 0.80 -0.6
2 0.2 0.6 0.8 0.70 -0.4
3 0.4 0.8 0.7 0.76 -0.4
> df$v2 <- with(df, C-D)
> df
    A   B   C    D   v1    v2
1 0.1 0.7 0.9 0.80 -0.6  0.10
2 0.2 0.6 0.8 0.70 -0.4  0.10
3 0.4 0.8 0.7 0.76 -0.4 -0.06


On Mon, Jan 31, 2011 at 7:02 AM, Ramya <ramya.victory at gmail.com> wrote:
>
> Hi,
>
> I have a Dataframe.
>
> A       B      C       D
> 0.1    0.7   0.9   0.8
> 0.20  0.60 0.80  0.70
> 0.40  0.80  0.70 0.76
>
> I need a resultant dataframe
>
> (A-B)   (C-D)
> -0.6     0.1
> -0.40    0.1
> -0.40   -0.06
>
> Any suggestion would be of a great help
>
> Thanks
> Ramya
>
> --
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