[R] integration function

[Uwe Ligges]

Christoph Scherber wrote:

> Dear R users,
> 
> I have tried to write a function which gives the step-wise integral for 
> an exponential function (moving from -3 to 3 in steps of 0.1, where the 
> output for every step shall be the integral under the curve of y against x.
> 
> However, something seems to be wrong with this function; can anyone 
> please help me?
> 
> x<-seq(-3,3,0.1)
> y<-exp(x)
> 
> 
> integral<-function(z,a,b,step){
> for(i in (1:((b-a)/step))){
>    c<-0
>    c[i]<-integrate(z,lower=a+(i-1)*step,upper=a+i*step)

integrate() expects a function, you specify a vector of values ....

Uwe Liges




>    print(c$integral)
> }}
> 
> integral(y,-3,3,0.1)
> 
> Best regards
> Christoph
> 
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