From r-sig-teaching-bounces at r-project.org Wed May 18 14:59:01 2016
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Date: Wed, 18 May 2016 14:58:14 -0400
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From: Steven Stoline <sstoline at gmail.com>
To: Gabor Grothendieck <ggrothendieck at gmail.com>
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Cc: R-sig-teaching <r-sig-teaching at r-project.org>
Subject: Re: [R-sig-teaching] Plot f(x) = x^(1/5)
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Dear All:
can someone please help me to plot the *Folium of Descrates:** x^3+y^3=3xy
for x<-seq(-5,5,0.010) and **y<-seq(-5,5,0.010) *
<https://www.google.com/search?biw=1155&bih=597&q=R:+Folium+of+Descartes&spell=1&sa=X&ved=0ahUKEwiBrsnWpeTMAhUFKB4KHU5TD0EQvwUIGSgA>
with thanks
steve
On Tue, May 17, 2016 at 9:07 AM, Gabor Grothendieck <ggrothendieck at gmail.com
Try this:
y <- sign(x) * abs(x)^(1/5)
On Tue, May 17, 2016 at 8:44 AM, Steven Stoline <sstoline at gmail.com>
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
--
Steven M. Stoline
1123 Forest Avenue
Portland, ME 04112
sstoline at gmail.com
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