Making a horizontal region between two functions

How do i fix this, my region is showing on the wrong part of the fuction, but i want it on the other part. can i get help

f = @(x) x.^3;

ivf = @(y) y.^(1/3);

g = @(x)x-x;

ivg = @(y) y-y;

a = 0;

b =1;

fplot(f, [a, b]), hold on

fplot(g, [a, b], 'LineWidth',2)

ycoord = linspace(a, b, 20);

xcoord = [ivf(ycoord); ivg(ycoord)];

plot(xcoord, [ycoord;ycoord]), hold off

thanks

Answer 1

[Torsten]

f = @(x) x.^3;
g = @(x) x.^(1/3);
a = 0;
b = 1;
hold on
fplot(f,[a,b])
n = 20;
for i = 1:n+1
  start = [g((i-1)/n*b),1];
  ende  = [(i-1)/n*b,(i-1)/n*b];
  plot(start,ende,'r')
end
hold off
grid on