Dear members,

I would like a help for extracting the values from a step function
(stepfun).

>From help(stepfun) we have the following example:

Y0<-c(1.,2.,4.,3.)
y0<-c(1.,2.,3.,4.)
sfun<-stepfun(1:3,y0,f=0)
plot(sfun)

Now, suppose instead I was given the object (*sfun*, say) from which I
wanted to extract the values generated by the function *stepfun*. More
precisely, I want to know how to get the X and Y (generated by the function
*sfun*) that are used in the graph (plot(sfun)).

Thanks in advance for helping me.

Ferreti

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