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

• Last Updated : 03 Jun, 2020

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

Syntax: tcrossprod(x)

Parameters:
x: numeric matrix

Example 1:

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

Output:

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

[, 1] [, 2]
[1, ]   10   14
[2, ]   14   20
```

Example 2:

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

Output:

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

[, 1] [, 2] [, 3]
[1, ]   66   78   90
[2, ]   78   93  108
[3, ]   90  108  126
```
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