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# Calculate the cross-product of a Matrix in R Programming – crossprod() Function

`crossprod()` function in R Language is used to return the cross-product of the specified matrix.

Syntax: crossprod(x)

Parameters:
x: numeric matrix

Example 1:

 `# R program to illustrate``# crossprod function`` ` `# Initializing a matrix with``# 2 rows and 2 columns``x <``-` `matrix(``1``:``4``, ``2``, ``2``)`` ` `# Getting the matrix representation``x`` ` `# Calling the crossprod() function``crossprod(x)`

Output:

```     [, 1] [, 2]
[1, ]    1    3
[2, ]    2    4

[, 1] [, 2]
[1, ]    5   11
[2, ]   11   25
```

Example 2:

 `# R program to illustrate``# crossprod function`` ` `# Initializing a matrix with``# 3 rows and 3 columns``x <``-` `matrix(``1``:``9``, ``3``, ``3``)`` ` `# Getting the matrix representation``x`` ` `# Calling the crossprod() function``crossprod(x)`

Output:

```     [, 1] [, 2] [, 3]
[1, ]    1    4    7
[2, ]    2    5    8
[3, ]    3    6    9

[, 1] [, 2] [, 3]
[1, ]   14   32   50
[2, ]   32   77  122
[3, ]   50  122  194
```