normalize | R Documentation |

Internal function for normalizing the data. This function makes a linear transformation of the inputs such that the values lie between -1 and 1.

```
normalize(x,base,spread)
```

`x` |
a vector or matrix that needs to be normalized. |

`base` |
If x is a vector, base is the minimum of x. If x is a matrix, base is a vector with the minimum for each of the columns of the matrix x. |

`spread` |
if x is a vector, spread=max(x)-base. If x is a matrix, spread is a vector calculated for each of the columns of x. |

z=2*(x-base)/spread - 1

A vector or matrix with the resulting normalized values.

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