Hi,
Try this:
df_new <- as.data.frame(lapply(df, FUN=function(x) x-x[1]))
I hope it works!
Ivan
Le 1/25/2011 10:20, Vincy Pyne a écrit :
Dear R helpers
I have a dataframe as
df = data.frame(x = c(1, 14, 3, 21, 11), y = c(102, 500, 40, 101, 189))
df
x y
1 1 102
2 14 500
3 3 40
4 21 101
5 11 189
# Actually I am having dataframe having multiple columns. I am just giving an
example.
I need to subtract all the rows of df by the first row of df i.e. I need to
subtract each element of 'x' column by 1. Likewise I need to subtract all
elements of column 'y' by 11. Thus I need an output like
df_new
x y
1 0 0
2 13 398
3 2 -62
4 20 -1
5 10 87
As I had mentioned above, I have number of columns in reality and thus I can't
use the command
say
df_new = data.frame(x = df$x-df$x[1], y = df$y-df$y[1])
Kindly guide
Thanking you all in advance
Regards
Vincy
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Ivan CALANDRA
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