Extend outer product.

Convert vector x into a matrix *X_{ij} = {x_i}^j*

1 | ```
ePow(x, colParamVector)
``` |

`x` |
Data vector. |

`colParamVector` |
Vector of column powers. |

A matrix X of size length(x) X length(colParamVector)

*X_{ij} = {x_i}^j*

1 2 | ```
x <- 1:6
ePow(x,0:2)
``` |

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