On Apr 7, 2010, at 9:55 PM, Erik Iverson wrote:
Jun Shen wrote:
Hi, David,
Thanks for the reply. However str() doesn't tell me exactly which
element is
different. I expect to see a is identical to b. But if there is
some minor
difference (usually by human mistake), I want to know which element
(numerical or character) is different.
So you're saying you have two data.frames with the same dimensions
and want to know which elements are different? What about different
attributes such as names, labels, etc?
A very naive first attempt might be something like:
df1 <- data.frame(a = 1:10, b = 2:11)
df2 <- data.frame(a = 1:10, b = c(2:10, 12))
mapply("==", df1, df2)
That might or might not reveal the differences that identical would
pick pick up:
> df1 <- data.frame(a = 1:10, b = 2:11)
> df2 <- data.frame(a = 1:10, b = 2:11)
> attr(df1, "row.names") <- letters[1:10]
> mapply("identical", attributes(df1), attributes(df2))
names row.names class
TRUE FALSE TRUE
> mapply("==", df1, df2)
a b
[1,] TRUE TRUE
[2,] TRUE TRUE
[3,] TRUE TRUE
[4,] TRUE TRUE
[5,] TRUE TRUE
[6,] TRUE TRUE
[7,] TRUE TRUE
[8,] TRUE TRUE
[9,] TRUE TRUE
[10,] TRUE TRUE
David Winsemius, MD
West Hartford, CT
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