support customize total

[kemistep]

i have more index ,i want to summary Compound growth rate

i can summary index Compound growth rate one by one ,but this is ineffective

so i want to help

计算复合年增长率 | Tableau Software

[nmannheimer]

Unfortunately we can't help support code directly here, but this link may help: https://interworks.com/blog/mbingham/2018/10/05/how-to-calculate-xirr-in-tableau-with-python/