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cli: improve error for roi IRR rootfinding problems (closes #1398)

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Dmitry Astapov 2020-11-18 00:51:55 +00:00
parent 9a820a6dec
commit 98a46fcaeb
1 changed files with 4 additions and 2 deletions
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6
hledger/Hledger/Cli/Commands/Roi.hs
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@ -216,8 +216,10 @@ internalRateOfReturn showCashFlow prettyTables (OneSpan spanBegin spanEnd valueB
(0.000000000001,10000)
(interestSum spanEnd totalCF) of
Root rate -> return ((rate-1)*100)
NotBracketed -> error' "Error: No solution -- not bracketed." -- PARTIAL:
SearchFailed -> error' "Error: Failed to find solution."
NotBracketed -> error' $ "Error (NotBracketed): No solution for Internal Rate of Return (IRR).\n"
++ " Possible causes: IRR is huge (>1000000%), balance of investment becomes negative at some point in time."
SearchFailed -> error' $ "Error (SearchFailed): Failed to find solution for Internal Rate of Return (IRR).\n"
++ " Either search does not converge to a solution, or converges too slowly."
type CashFlow = [(Day, Quantity)]