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Gilles Sadowski commented on MATH-1514: --------------------------------------- I'm not sure I undrestand: Do you report an issue with code from https://poi.apache.org/ ? If so, this is not the appropriate issue-tracking project. > IRR NaN When it should give back a value > ---------------------------------------- > > Key: MATH-1514 > URL: https://issues.apache.org/jira/browse/MATH-1514 > Project: Commons Math > Issue Type: Bug > Affects Versions: 3.6 > Reporter: Fawaz Alhenaki > Priority: Minor > > I have created a sample of when the issue occurs. IRR in apache documentation > says that covers "20 tries" as shown here > [https://poi.apache.org/apidocs/dev/org/apache/poi/ss/formula/functions/Irr.html] > > which is identical to Microsoft Excel > [https://support.office.com/en-us/article/irr-function-64925eaa-9988-495b-b290-3ad0c163c1bc] > This indicate that the result is the same between the two; however, in the > case of apache poi, it seems that the result is returned as NaN (while excel > returns the actual result). -- This message was sent by Atlassian Jira (v8.3.4#803005)