Solve or plot the reverse of an equation in R

Question

I plotted an expression curve, ie curve(-log((1-x)/0.9999)/x,ylim=c(0,4)) . However, I want to see the reverse relationship, ie y changes over x instead of x changes over y . Are there any R function can plot it automatically? Or a function that can solve the equation?

Answer 1

There are two obvious choices:

(i) derive the inverse function algebraically (trivial in this case),

That is, take y=-log((1-x)/0.9999) and make x the subject of the equation (which would require straightforward algebraic manipulation suitable for a question on math.SE if it's not obvious how to proceed)...

... and then use curve on the result of that, or

(ii) use plot rather than curve to plot a set of (x,y) pairs (set type="l" to get a curve), and simply interchange which is x and which is y in the call to plot.