# checkNames

##### Consistency test between the column names of two matrices

Tests if the names of a second matrix are equal to a given matrix up to a permutation, and permute its columns accordingly. When the second one has no column names, the names of the first one are used in the same order.

- Keywords
- models

##### Usage

```
checkNames(X1, X2, X1.name = "X1", X2.name = "X2")
checkNamesList(X1, l2, X1.name = "X1", l2.name = "l2")
```

##### Arguments

- X1
a matrix containing column names.

- X2
a matrix containing the same number of columns.

- l2
a list with length

`ncol(X1)`

.- X1.name
,

- X2.name
optional names for the matrix

`X1`

and`X2`

theirselves (useful for error messages).- l2.name
optional names for

`l2`

.

##### Details

If `X2`

does not contain variable names, then the names of `X1`

are used in the same order, and `X2`

is returned with these names. Otherwise, if the column names of `X1`

and `X2`

are equal up to a permutation, the column of `X2`

are permuted according to the order of `X1`

' names.

##### Value

The matrix `X2`

, with columns possibly permuted. See details.

##### See Also

##### Examples

```
# NOT RUN {
X1 <- matrix(1, 2, 3)
X2 <- matrix(1:6, 2, 3)
colnames(X1) <- c("x1", "x2", "x3")
checkNames(X1, X2)
# attributes the same names for X2, and returns X2
colnames(X2) <- c("x1", "x2", "x5")
# }
# NOT RUN {
checkNames(X1, X2)
# }
# NOT RUN {
# returns an error since the names of X1 and X2 are different
colnames(X2) <- c("x2", "x1", "x3")
checkNames(X1, X2)
# returns the matrix X2, but with permuted columns
l2 <- list(x3 = 1, x2 = c(2, 3), x1 = -6)
checkNamesList(X1, l2)
# }
```

*Documentation reproduced from package DiceKriging, version 1.5.6, License: GPL-2 | GPL-3*