Returns a particular rate or rates from a curve

1 2 | ```
## S3 method for class 'rate_curve'
r[rate_type = "zero_eff", x = NULL]
``` |

`r` |
The rate_curve object |

`rate_type` |
The rate type |

`x` |
The points in time to return |

If `x`

is `NULL`

, then returns a rate function of `rate_type`

type.
Else, it returns the rates of `rate_type`

type and corresponding to time `x`

1 2 3 | ```
r <- rate_curve(rates = c(0.1, 0.2, 0.3), rate_type = "zero_eff")
r["zero_eff"]
r["swap",c(1.5, 2)]
``` |

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