How to pass equation to a function where the function subplots graphs?

This is my main function:

t = 3;

y_exact_overdamped = @(x)((5/3)*exp(-x))-((2/3)*exp(-4*x));

y_title_overdamp = "Position vs Time, Overdamped";

figure_d(t, y_exact_overdamped, y_title_overdamp)

And this is the function code:

function figure_d(t, y_exact, title_y)

subplot(2,1,1);
x = linspace(0,t);
y1 = y_exact;
plot(x,y1);
title(title_y)
xlabel('time')
ylabel('position')

When I take out @(x) from the main function it shows an error that x is undefined. But when I use @(x) it is an invalid input when subplotting. I do not understand how I can pass a equation to a function and plot it using subplot as I will need two graphs in one figure. Help would be appreciated. Thanks.

[Rik]

And if you use y1 = y_exact(x);?

Answer 1

[James Tursa]

y_exact_overdamped is a function handle. You pass that into your function which gets it as y_exact. You then assign this to y1. All of these are still just function handles. You need to evaluate them with your x values. E.g.,

plot(x,y1(x));