**bsp** is used to approximate smooth functions by B-splines.

1 | ```
bsp(x,kn)
``` |

`x` |
values of the explanatory variable. |

`kn` |
(optional) the number of internal knots . The default value is |

.

This function uses the routine `bs()`

of the R package *splines*.

`x` |
the B-spline basis matrix, which is cubic. |

Luz Marina Rondon <lumarp@gmail.com> and Heleno Bolfarine

De Boor, C. (1978). A practical Guide to Splines. Applied Mathematical Sciences. Springer-Verlag, New York.

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