Re: [R] Question with uniroot function

Hi Jeff, Thanks for the reply. I am aware that the sign needs to be different at the ends of the starting interval. Another question: Is there a way to set the right end point ( (the upper argument in the uniroot function below) as the point where the function takes on its minimun, for

Re: [R] Question with uniroot function

Use optimize() to find the minimum and feed that value into uniroot(). Bill Dunlap TIBCO Software wdunlap tibco.com On Thu, Apr 16, 2015 at 7:47 AM, li li hannah@gmail.com wrote: Hi Jeff, Thanks for the reply. I am aware that the sign needs to be different at the ends of the starting

Re: [R] Question with uniroot function

Thank you. 2015-04-16 12:33 GMT-04:00 William Dunlap wdun...@tibco.com: Use optimize() to find the minimum and feed that value into uniroot(). Bill Dunlap TIBCO Software wdunlap tibco.com On Thu, Apr 16, 2015 at 7:47 AM, li li hannah@gmail.com wrote: Hi Jeff, Thanks for the

[R] Question with uniroot function

Hi all, In the following code, I am trying to use uniroot function to solve for the root (a and b in code below) for function f1. I am not sure why uniroot function does not give the answer since when we look the graph, the function does cross 0 twice. Any suggestion? Thanks. Hanna

Re: [R] Question with uniroot function

You really need to read the help page for uniroot. The sign needs to be different at the ends of the starting interval. This is a typical limitation of numerical root finders. --- Jeff NewmillerThe

Re: [R] question with uniroot function

As others will tell you: you need to provide a reproducible example. What are p1, u1, u2 ? quote Dear all, I have the following problem with the uniroot function. I want to find roots for the fucntion Fp2 which is defined as below. Fz -

[R] question with uniroot function

Dear all, I have the following problem with the uniroot function. I want to find roots for the fucntion Fp2 which is defined as below. Fz - function(z){0.8*pnorm(z)+p1*pnorm(z-u1)+(0.2-p1)*pnorm(z-u2)} Fp - function(t){(1-Fz(abs(qnorm(1-(t/2)+(Fz(-abs(qnorm(1-(t/2)} Fp2 -

Re: [R] question with uniroot function

Dear all, I forgot to mention the values for the parameters in the first email. u1 - -3 u2 - 4 alpha - 0.05 p1 - 0.15 Thank you very much. 2011/9/3 li li hannah@gmail.com Dear all, I have the following problem with the uniroot function. I want to find roots for the fucntion

Re: [R] question with uniroot function

On 03.09.2011 18:31, li li wrote: Dear all, I forgot to mention the values for the parameters in the first email. u1- -3 u2- 4 alpha- 0.05 p1- 0.15 Thank you very much. 2011/9/3 li lihannah@gmail.com Dear all, I have the following problem with the uniroot function. I want