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https://issues.apache.org/jira/browse/MATH-1238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14604095#comment-14604095
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Gilles commented on MATH-1238:
------------------------------
Is it the "automatically-computed" or a "user-defined" initial value whose
function evaluation is NaN?
In the former case, the library might try to generate another start value.
Could you provide a unit test that shows the problem?
> NoBracketingException send with valid brackets
> ----------------------------------------------
>
> Key: MATH-1238
> URL: https://issues.apache.org/jira/browse/MATH-1238
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.5
> Reporter: charles sitbon
> Priority: Minor
>
> The brent solver sometimes send a NoBracketingException with valid brackets :
> example for a beta distribution with large Beta (285) and alpha around 15
> Exception in thread "main"
> org.apache.commons.math3.exception.NoBracketingException: function values at
> endpoints do not have different signs, endpoints: [0, 1], values: [-0.15,
> 0.85]
> the exception is actually caused by the yinitial which is Nan
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