Determine Cause of `identical()` returning FALSE

Question

I have two data.frames that I expect to be the same, but identical() returns false.

As a background, one DF comes from the Iris data ARFF file, while the other a .rdata file, if that changes anything

All the elements in x == y are TRUE, the class is the same for both variables, the rownames are the same for both, as are the colnames.

How do I determine what triggered the FALSE output?

EDIT: output of all.equal as stated below

[1] "Component 1: Attributes: < Modes: list, NULL >"                                
[2] "Component 1: Attributes: < names for target but not for current >"             
[3] "Component 1: Attributes: < Length mismatch: comparison on first 0 components >"

EDIT: output of attributes of both

> attributes(dataset)
$names
[1] "Class"        "petal-length" "petal-width"  "sepal-length" "sepal-width" 
$row.names
[1]   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32
[33]  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  58  59  60  61  62  63  64
[65]  65  66  67  68  69  70  71  72  73  74  75  76  77  78  79  80  81  82  83  84  85  86  87  88  89  90  91  92  93  94  95  96
[97]  97  98  99 100
$class
[1] "data.frame"

> attributes(dataset2)
$names
[1] "Class"        "petal-length" "petal-width"  "sepal-length" "sepal-width" 
$row.names
[1]   1   2   3   4   5   6   7   8   9  10  11  12  13  14  15  16  17  18  19  20  21  22  23  24  25  26  27  28  29  30  31  32
[33]  33  34  35  36  37  38  39  40  41  42  43  44  45  46  47  48  49  50  51  52  53  54  55  56  57  58  59  60  61  62  63  64
[65]  65  66  67  68  69  70  71  72  73  74  75  76  77  78  79  80  81  82  83  84  85  86  87  88  89  90  91  92  93  94  95  96
[97]  97  98  99 100
$class    
[1] "data.frame"
`

output from str(x):

> str(dataset)
'data.frame':   100 obs. of  5 variables:
$ Class       : atomic  1 0 1 0 1 0 0 0 1 1 ...
..- attr(*, "feature.type")= chr "Numeric"
$ petal-length: atomic  6.3 4.8 7.2 5.2 6.7 4.9 5.5 5.3 6.4 6.1 ...
..- attr(*, "feature.type")= chr "Numeric"
$ petal-width : atomic  2.9 3.4 3.2 3.4 3.1 3.6 3.5 3.7 3.1 2.6 ...
..- attr(*, "feature.type")= chr "Numeric"
$ sepal-length: atomic  5.6 1.6 6 1.4 5.6 1.4 1.3 1.5 5.5 5.6 ...
..- attr(*, "feature.type")= chr "Numeric"
$ sepal-width : atomic  1.8 0.2 1.8 0.2 2.4 0.1 0.2 0.2 1.8 1.4 ...
..- attr(*, "feature.type")= chr "Numeric"
> str(dataset2)
'data.frame':   100 obs. of  5 variables:
$ Class       : num  1 0 1 0 1 0 0 0 1 1 ...
$ petal-length: num  6.3 4.8 7.2 5.2 6.7 4.9 5.5 5.3 6.4 6.1 ...
$ petal-width : num  2.9 3.4 3.2 3.4 3.1 3.6 3.5 3.7 3.1 2.6 ...
$ sepal-length: num  5.6 1.6 6 1.4 5.6 1.4 1.3 1.5 5.5 5.6 ...
$ sepal-width : num  1.8 0.2 1.8 0.2 2.4 0.1 0.2 0.2 1.8 1.4 ...
> 

Answer 1

Try something like:

all.equal(x,y)

Otherwise look at library(compare).

Answer 2

If you want to know the one that's different, you can use

which(x != y, arr.ind=TRUE)