plot - When plotting a curve in R, a piece of the curve gets cut off, not sure why -


i trying plot formula. x approaches 0 right, y should approaching infinity, , curve should going upwards close y-axis. instead gets cut off @ y=23 or so.

my_formula = function(x){7.9*x^(-0.5)-1.3} curve(my_formula,col="red",from=0 ,to=13, xlim=c(0,13),ylim=c(0,50),axes=t, xlab=na, ylab=na)

i tried play from= parameter, , got needed when put from=-4.8 have no idea why works. in fact x doesn't less 0, , from/to should represent range of x values, they? if explain me, amazing! thank you!

by default, curve chooses 101 x-values within (from, to) range, set default value of n argument. in case means there aren't many values close enough 0 show full behaviour of function. increasing number of values plotted n=500 helps:

curve(my_formula,col="red",from=0 ,to=13,        xlim=c(0,13),ylim=c(0,50),axes=t, xlab=na, ylab=na,        n=500)

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