*Last updated: 2023-03-16.*
# tf_quant_finance.experimental.instruments.ratecurve_from_discounting_function
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Returns `RateCurve` object using the supplied function for discounting.
```python
tf_quant_finance.experimental.instruments.ratecurve_from_discounting_function(
discount_fn, dtype=None
)
```
#### Args:
* `discount_fn`: A python callable which takes a `DateTensor` as an input and
returns the corresponding discount factor as an output.
* `dtype`: `tf.Dtype`. Optional input specifying the dtype of the real tensors
and ops.
#### Returns:
An object of class `RateCurveFromDiscountingFunction` which uses the
supplied function for discounting.