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Thread Subject:
using gamma inc function

Subject: using gamma inc function

From: Nur Nazurah

Date: 6 Jul, 2011 11:08:10

Message: 1 of 2

hi

i have this equation of I(s*(tm-(sigmat)),1+ps)- I(s*(tm-(sigmat)-tau)) and row 1+ps).
Where I is incomplete gamma function..
i would like to get the value of s, p and sigmat form this equation and give a boundary value where it cannot be negative value.. could i use gammainc function? and how..

thanks a lot.
 

Subject: using gamma inc function

From: Steven_Lord

Date: 6 Jul, 2011 13:23:51

Message: 2 of 2



"Nur Nazurah " <Kle_vrgal69@yahoo.com> wrote in message
news:iv1fmq$6tu$1@newscl01ah.mathworks.com...
> hi
> i have this equation of I(s*(tm-(sigmat)),1+ps)- I(s*(tm-(sigmat)-tau))
> and row 1+ps).
> Where I is incomplete gamma function..
> i would like to get the value of s, p and sigmat form this equation and
> give a boundary value where it cannot be negative value.. could i use
> gammainc function? and how..

Your question is unclear. Do you mean that you have tm and tau values and
you want to find s, p, and sigmat such that gammainc(s*(tm-(sigmat)),1+ps)-
gammainc(s*(tm-(sigmat)-tau)) is equal to 1+p*s?

If so, depending on the size of your tm and tau variables, FSOLVE may be
able to do this for you; but if you just have scalar tm and tau then I think
you're out of luck.

--
Steve Lord
slord@mathworks.com
To contact Technical Support use the Contact Us link on
http://www.mathworks.com

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