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.
>
>
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