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# What's new in Sigma

> Sigma release notes for Aug 18, 2023: Financial functions: IPmt and PPmt, Sankey diagrams (GA release), and more.

## Functions

### Financial functions: IPmt and PPmt

Two additional financial functions are available to complement the **[Pmt](https://help.sigmacomputing.com/docs/pmt)** (payment) function, which calculates the size of a loan repayment with a constant interest rate and equal installments.

|                                                       |                                                                                                                     |
| :---------------------------------------------------- | :------------------------------------------------------------------------------------------------------------------ |
| **[IPmt](https://help.sigmacomputing.com/docs/ipmt)** | (interest payment) calculates the part of a loan payment that is allocated to the compounding interest on the loan. |
| **[PPmt](https://help.sigmacomputing.com/docs/ppmt)** | (principal payment) calculates the part of a loan payment that is allocated to reducing the principal owed.         |

## Workbook elements

### Sankey diagrams (GA release)

**Sankey** visualization elements are now available for general use.

Sankey diagrams are typically used to assess the flow and change of data between stages in a process or system. Create simple Sankey diagrams to demonstrate data distribution, workflows, networks, etc., or build advanced multi-level diagrams to analyze complex data relationships and identify changes in variables across stages, categories, or periods.

For more information about **Sankey** visualization elements, see [Build a Sankey diagram](https://help.sigmacomputing.com/docs/build-a-sankey-diagram).

## Bug fixes

* Circular markers in scatter plot size legends are no longer distorted.