On 03/24/2014 07:00 AM, amcc wrote:
Hi,
I have the code below to generate a pentagon in R. I have generated a
regular scatterplot and need to draw a scatterplot with a pentagon at each
(x,y) position, for the radius use r x 0.3. The hint I've been given is
that I do not need to store the polygons in a list, simply construct and
draw the polygons within a for loop. Four hours have gone by and I'm no
closer, so any help would be appreciated. My original scatterplot code is
plot(Sepal.Width~Sepal.Length, data=iriss)
mk_pent<-
function(x,y,r){
angle<-(0:4)*360/5+90
angle<-angle*pi/180
xs<-r*cos(angle)+x
ys<-r*sin(angle)+y
cbind(x=xs,y=ys)}
Hi A,
Your function is almost there, it just doesn't close the pentagon. You
might think of drawing the lines within the function to make things
easier. Once you can successfully draw a pentagon on an existing plot,
you can work out how to pass your x and y coordinates successively to it
within the for loop.
Jim
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