MATLAB: G=(x).(t)+(r./(s.^2)).((y.^2).-x).*t

matlab operator

>> returns the error: unexpected matlab operator >> please help

You have a dot operator where you do not need one:

g=(x).*(t)+(r./(s.^2)).*((y.^2).-x).*t
                               ^

This works:

g=(x).*(t)+(r./(s.^2)).*((y.^2)-x).*t

I guess u is the unit-step function. You can try this if you have symbolic toolbox

syms t
x = 2*heaviside(-t/4+2);
fplot(x, [-10 10]);

Without symbolic toolbox

u = @(x) 1*(x>=0);
t = -10:0.01:10;
x = 2*u(-t/4+2);
plot(t, x)

Hi,

Kindly have a look at the following code:

x = linspace(-5,5);
y = 2+3*pi*4*x.*sinc(x);
plot(x,y)

Links:

Thanks