falhenaki commented on code in PR #1216:
URL: https://github.com/apache/poi/pull/1216#discussion_r3789710722
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poi/src/main/java/org/apache/poi/ss/formula/functions/Irr.java:
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@@ -130,7 +168,149 @@ public static double irr(double[] values, double guess) {
x0 = x1;
}
// maximum number of iterations is exceeded
- LOGGER.atWarn().log("Returning NaN because IRR has reached max number
of iterations allowed: {}", MAX_ITERATION_COUNT);
Review Comment:
Those three logs all say "Returning NaN because ...", and after this change
that's no longer what happens at those points. A NaN from the Newton loop is
now just an internal signal to try the bracketed fallback, it isn't returned to
the caller anymore. If I kept the logs where they were, every cash flow the
fallback rescues would warn about a NaN the caller never actually sees. So I
moved the logs to the two spots where a NaN really is final, the message is
accurate there.
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