Drawing an inverse of function

how can i draw the reflection of any function such as shown in picture ?

[John D'Errico]

Sigh. That is NOT the inverse of a function.

Answer 1

[Walter Roberson]

Supposing you have x and y as row vectors, and that the point of reflection is to be the end of the existing x, then

new_x = [x, 2*x(end)-fliplr(x(1:end-1))];
new_y = [y, fliplr(y(1:end-1))];
plot(new_x, new_y);

Drawing the bar is an exercise for you. Hint: look at ylim()