MATLAB: Variable into a constsant for a plot

Question

Hi,

I am trying to plot an equation with two variales but setting one variable as a constant for the plot.

Here is the code i have tried so far:

syms w sol(t)
sol(t) = (1/(400-w^2)) * (sin(w*t) - (w/20)*sin(20*t))
for w=5:10
    fplot(sol(t))
    hold on
end
hold off

Here is something else I have tried with a simplied version of the problem:

syms y(x) a
y(x) = a*x
a = 1
fplot(y(x))

OR

syms y(x) a
y(x) = a*x
assume(a==1)
fplot(y(x))

Thanks in advance for any help you can give.

Answer 1

The function you want to use is

subs(s,old,new)

Check out how to use it here