# Promote a vector to a single-column or single-row matrix

### Description

The `promote`

function promotes a vector argument to a single-column or
single-row matrix. Matrix arguments are returned unmodified.

### Usage

1 |

### Arguments

`x` |
A vector or matrix. |

`byrow` |
Logical value: if |

### Value

A matrix version of the `x`

argument.

### Author(s)

Jon Clayden

### References

Please cite the following reference when using TractoR in your work:

J.D. Clayden, S. MuĂ±oz Maniega, A.J. Storkey, M.D. King, M.E. Bastin & C.A. Clark (2011). TractoR: Magnetic resonance imaging and tractography with R. Journal of Statistical Software 44(8):1-18. http://www.jstatsoft.org/v44/i08/.

### See Also

`matrix`