Well - the _procedure_ will give a result.
But think of f(x) = {-1; x <= 1/3 and 1; x > 1/3
What should inf{x| F(x) >= 0} be?
What should the procedure return?
> On Apr 10, 2017, at 10:38 AM, Bert Gunter <bgunter.4...@gmail.com> wrote:
>
> Given what she said, how does the procedure I suggested fail?
>
> (Always happy to be corrected).
>
> -- Bert
> Bert Gunter
>
> "The trouble with having an open mind is that people keep coming along
> and sticking things into it."
> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>
>
> On Mon, Apr 10, 2017 at 1:57 AM, Boris Steipe <boris.ste...@utoronto.ca>
> wrote:
>> Are you sure this is trivial? I have the impression the combination of an
>> ill-posed problem and digital representation of numbers might just create
>> the illusion that is so.
>>
>> B.
>>
>>
>>
>>
>>> On Apr 10, 2017, at 12:34 AM, Bert Gunter <bgunter.4...@gmail.com> wrote:
>>>
>>> Then it's trivial. Check values at the discontinuities and find the
>>> first where it's <0 at the left discontinuity and >0 at the right, if
>>> such exists. Then just use zero finding on that interval (or fit a
>>> line if everything's linear). If none exists, then just find the first
>>> discontinuity where it's > 0.
>>>
>>> Cheers,
>>> Bert
>>>
>>>
>>> Bert Gunter
>>>
>>> "The trouble with having an open mind is that people keep coming along
>>> and sticking things into it."
>>> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>>>
>>>
>>> On Sun, Apr 9, 2017 at 5:38 PM, li li <hannah....@gmail.com> wrote:
>>>> Hi Burt,
>>>> Yes, the function is monotone increasing and points of discontinuity are
>>>> all known.
>>>> They are all numbers between 0 and 1. Thanks very much!
>>>> Hanna
>>>>
>>>>
>>>> 2017-04-09 16:55 GMT-04:00 Bert Gunter <bgunter.4...@gmail.com>:
>>>>>
>>>>> Details matter!
>>>>>
>>>>> 1. Are the points of discontinuity known? This is critical.
>>>>>
>>>>> 2. Can we assume monotonic increasing, as is shown?
>>>>>
>>>>>
>>>>> -- Bert
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Bert Gunter
>>>>>
>>>>> "The trouble with having an open mind is that people keep coming along
>>>>> and sticking things into it."
>>>>> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>>>>>
>>>>>
>>>>> On Sun, Apr 9, 2017 at 1:28 PM, li li <hannah....@gmail.com> wrote:
>>>>>> Dear all,
>>>>>> For a piecewise function F similar to the attached graph, I would like
>>>>>> to
>>>>>> find
>>>>>> inf{x| F(x) >=0}.
>>>>>>
>>>>>>
>>>>>> I tried to uniroot. It does not seem to work. Any suggestions?
>>>>>> Thank you very much!!
>>>>>> Hanna
>>>>>>
>>>>>> ______________________________________________
>>>>>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>>>>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>>>>> PLEASE do read the posting guide
>>>>>> http://www.R-project.org/posting-guide.html
>>>>>> and provide commented, minimal, self-contained, reproducible code.
>>>>
>>>>
>>>
>>> ______________________________________________
>>> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see
>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>
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