# Re: [R] Sum up the values of a function

From: Stefan Wagner <Stef.Wagner_at_students.uni-mannheim.de>
Date: Fri 10 Jun 2005 - 21:58:54 EST

```x1 <- c(34.67,19.91,47.48,22.48,17.34,24.42)
m1 <- c(1,0,0,0,0,0)
n1 <- c(1,1,1,1,1,1)
dec1 <- c(0,0,0,0,1,0)
x2 <- c(50.98,30.63,31.37,21.17,21.49,39.41,46.85,38.08)
m2 <- c(1,0,0,0,1,0,2,1)
```

n2 <- c(3,3,3,3,3,3,3,3)
dec2 <- c(0,0,0,0,0,0,0,0)

I hope this is all you need,

Stefan

> Hi
>
> Your example is not reproducible as we do not know x1.
> Do you by chance seek for something like aggregate? If yes see
>
> ?aggregate
> or
> ?by
>
> BTW, do you have some trouble with your space bar?
>
> HTH
>
> Petr
>
> On 10 Jun 2005 at 13:08, Stefan Wagner wrote:
>
>> Dear R-Users,
>>
>> I have to do a maximum-likelihood estimation and have now a problem
>> concerning how to sum up my function values in a smart way. I don't
>> know how to explain it easyly, so I give you the code and show you
>> where my problem is. I have shorten the code a little bit, so that you
>> only get the necessary facts:
>>
>> ws12 <- function (z, i) (1/(1+exp(z*(z-x1[i]-
>> z*(m1[i]/n1[i]-0.5))))) ws37 <- function (z, i)
>> (1/(1+exp(z*(z-x2[i]- z*(m2[i]/n2[i]-0.5))))) wsAttack12 <-
>> function (z,i) (ws12(z,i)*dec1[i]+(1-ws12(z,i))*(1-dec1[i]))
>> wsAttack37 <- function (z,i)
>> (ws37(z,i)*dec2[i]+(1-ws37(z,i))*(1-dec2[i])) logwsAttack12 <-
>> function (z,i) (log(wsAttack12(z,i))) logwsAttack37 <- function (z,i)
>> (log(wsAttack37(z,i))) ws12sum <- function (z)
>> (logwsAttack12(z,i=1)+logwsAttack12(z,i=2)+logwsAttack12(z,i=3)+logwsA
>> ttack12(z,i=4)+logwsAttack12(z,i=5)+logwsAttack12(z,i=6)) ws37sum <-
>> function (z)
>> (logwsAttack37(z,i=1)+logwsAttack37(z,i=2)+logwsAttack37(z,i=3)+logwsA
>> ttack37(z,i=4)+logwsAttack37(z,i=5)+logwsAttack37(z,i=6)+logwsAttack37
>> (z,i=7)+logwsAttack37(z,i=8)) wsLOG <- function (z) (ws12sum(z) +
>> ws37sum(z)) LogSum <- function (z) (-sum(wsLOG(z))) SP <- c(0.16,
>> 0.10, 44, 0.80, 46) out <- nlm (LogSum, p=SP) out
>>
>> For explanation: x1[i], x2[i], m1[i], m2[i], n1[i], n2[i] are given
>> data and z[1:5] are my estimates. My problem is that I have more than
>> one session with diffent number of datas so that I am searching for a
>> general way of summing up my logwsAttack12 and logwsAttack37. The
>> program should recognize how many data are in my table concerning ws12
>> and how many concerning ws37 and should, in dependency of z, sum them
>> up. I hope you understand my problem and hopefully someone is able to
>> solve it. Many thanks for the moment.
>>
>> Best regards,
>>
>> Stefan Wagner
>>
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