Finding a Diff within a Dataframe columns

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
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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Finding a Diff within a Dataframe columns

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