[R-sig-teaching] Plot f(x) = x^(1/5)

[Mark Daniel Ward]

Dear Steven,

Well, the values x^(1/5) are complex-valued (not real-valued) when x is 
negative.

Did you want to plot the absolute value of x^(1/5) instead?

Mark

Mark Daniel Ward, Ph.D.
Associate Professor and Undergraduate Chair
Department of Statistics
Purdue University
150 North University Street
West Lafayette, IN 47907-2067
mdw at purdue.edu
phone: (765) 496-9563


On 5/17/16 8:44 AM, Steven Stoline wrote:
> Dear All:
>
>
> I am trying to plot the function f(x) = x^(1/5) for x=seq(-2,2,0.01). It
> give me only the plot of f(x) for the positive part of x. I checked the
> values of f(x), it is NaN for all negative values of x.
>
> *this is my code:*
>
>
> x<-seq(-2,2,0.01)
> y<- (x)^(1/5)
> plot(x,y, type="l", lwd=3, xlab = " ", ylab = " ", col="blue")
> abline(v=0, col="gray", lty=2, lwd=3)
> abline(h=0, col="gray", lty=2, lwd=3)
>
>
>
> any help will be appreciated.
>
>
> with many thanks
> steve