[R] Error in match.fun(f) : object 'x' not found

[Uwe Ligges]

On 21.02.2017 18:29, C W wrote:
> Dear R list,
>
> I am having a little trouble understanding the R code. I want to compute
> expectation of normal pdf.
>
> I did the following:
>
> integrate(x*dnorm(x, rate=1), -Inf, Inf)


integrate needs a function as first argument, hence:

  integrate(function(x) x*dnorm(x, rate=1), -Inf, Inf)

and then you have the next error that is more obvious to fix...



> Error in match.fun(f) : object 'x' not found
>
> If I did this, I get,
> integrate(dexp(x, rate=1), -Inf, Inf)
> Error in dexp(x, rate = 1) : object 'x' not found

same here.


> How should I fix this? I remember when I did it for curve(), it was fine.
>
> curve(pexp(x, rate = 1/2), from = 0, to = 5)

curve() is an exception in that it can use an unevaluated  function call.

Best,
Uwe Ligges



> What am I not getting here? Thank you so much!
>
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>
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