[Rcpp-devel] uniroot problem

[Dirk Eddelbuettel]

On 24 December 2019 at 13:45, Shaami wrote:
| Could you please help with the following example? I do not get function
| value at zero using uniroot() in R. Could you suggest something? I want
| function value zero at any point like 2.4, 2.5, 2.6, 4.5, 5.9 etc.
| 
| Thank You
| 
| x = c(-100, -20, 100, 230, 500, 920, 1000)
| a = c(1000, 12, 300, 0, 100, 300, 750)
| Fn = function(t, x, a){
|   sum = 0
|   for(i in 1:length(x)){
|     sum = sum + punif(t, min=x[i]-a[i], max=x[i]+a[i])
|   }
|   return(sum)
| }uniroot(function(t){Fn(t, x, a) - 2.4}, interval=c(min(x-a), max(x+a)))
| uniroot(function(t){Fn(t, x, a) - 2.5}, interval=c(min(x-a), max(x+a)))
| uniroot(function(t){Fn(t, x, a) - 2.8}, interval=c(min(x-a), max(x+a)))

What have you tried so far?

Dirk

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