[R] can't integrate in loop

Jessica Streicher
Fri, 30 Nov 2012 18:34:49 -0000

Thats not a very precise question. I'll try anyway..

- if you use c, you need to separate the values by commas
- i think you mean seq(1,100,0.1), otherwise x only has one value
- function sen is not defined
- If you call int(1), upper will be 1, not x[i]
- why are you making a function and calling it instead of just : int1[i] <-
integrate(H, lower = 0, upper = x[i]) ?
- looking at ?integral, you may rather want integral(..)$value

On 30.11.2012, at 13:32, faeriewhisper wrote:

> Hi guys!
> I have to compute something and i don't know what i'm doing wrong.
my code
> is a bit complex, but imagine that is something like this:
>
> a = c(1 2 3 4)
> ia = length(a)
>
> x = seq(1,100,length=0.1)
> ib = length(x)
>
> for(j in 1:ia) {
>   H = function(x) {sen(x) + a[j]}
>      for(i in 1:ib) {
> 		int = function(x) { integrate(H, lower = 0, upper = x[i])}
> 		int1[i] = int(1)
> 		}
> 	end
>   int1 = unlist(int1)
>   ss[j] = sum(int1)
> }
> end
>
> if i try this code without the for loop it's ok, but when i put the
cycle
> on, i get all sort of errors...
> Thank you for your help :)
>
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> --
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