[R] Problem with apply list to function: numerical expression has 4 elements: only the first used

[Narua]

Hello ,

I want to try R for statistics. 

Therefore, I defined a function f with parameters m and k, which calculates
a to sqrt(x) proportional density function: 
f <- function(m,k)((1/(sum(sqrt(1:m))))*sqrt(k))

A function F sums the results in order to get a distribution function:
F <- function(m,i)(sum(f(m,1:i)))
It works e.g. for m=4:
> F(4,1)
[1] 0.1627005
> F(4,4)
[1] 1

If I want to see all results for m=4, I write
> F(4,1:4)
[1] 0.1627005
Warning message:
In 1:i : numerical expression has 4 elements: only the first used

what does the error message mean? 
and how can I solve it?

I've already tried rapply but I get the same error and googled for a while
but there is nowhere a satisfying answer

Can someone help me here?

many thanks in advance, 
Narua




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