Making y-axis positive in both directions

I have two sets that I need to graph in opposite directions but both positively counting. So A increasing 0, 1, 2, ... etc. upwards above the x-axis and B increasing 0, 1, 2,...etc. downwards below the x-axis. Here's the exact code I am using right now but a general answer is appreciated. The third En set would also be graphed above the x-axis.

clc
clear
format long

r = 0:.001:1;
A = -1.436;
B = 7.32e-6;
n = 8;
rn = r.^n;

Ea = -1*(A./r);
Er = B./rn;
En = Ea + Er;

hold on

plot(r, Ea, "-.r", r, Er, "--b", r, En)


legend("Attractive Energy","Repulsive Energy","Net Energy")
set(gca, 'YScale', 'log')
xlabel("interionic distance (nm)")
ylabel("Energy (eV)")
title("Interionic Energy vs. Distance Na^+-Cl^- ion pair")

[Dyuman Joshi]

It's not clear to me what the expected output is.

Could you show an example using the figure obtained in the question description?

Answer 1

[Image Analyst]

Well I think that would be confusing and deceptive to the reader. But anyway, do you want just the exponent to be positive? You can make up y labels with sprintf() and then use yticklabels to have them be whatever you want.