How can I plot a population growth rate function in R?

Question

The below is my code for plotting a graph in R but some negative values are also appearing in the graph... Why is that? Am I doing something wrong?

N = 1:100

r = 1

K = 1

r1 = list(r*N*(1 - (N/K)))

plot(N, r1[[1]])

The plot looks like:

 

Answer 1

As far as I can see at r1, the data is being plotted correctly. But the values starts from zero and decrease.

For removing the negative values, you can simply just add a scale factor like:

#add a scale factor - all values positive

r2<-r1[[1]]+10000

plot(N, r2)

or you can also perform the following:

#add a scale factor - span y = 0 

r3<-r1[[1]]+5000

plot(N, r3)

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