How to Plot a Continues Tiime Signal

i am unable to plot the following signal can anyone help me?

a) x(t)u(1-t); b) x(t)[u(t)-u(t-1)];

Please Help me!

I just want the matlab code

Answer 1

[Muhammad Fauzan]

% Domain
a=0;
b=1;
c=0;
d=1;
%Pembagian Grid
xgrid=4;
ygrid=3;
U=(zeros(ygrid+1,xgrid+1));
x=linspace(a,b,xgrid+1);
for i=1:xgrid+1
    U(1,i)=sym(sin(pi*x(i)));
end
w=sym('w',[1(xgrid-1)*(ygrid-1)]);
k=1;
for j=2:ygrid
    for i=2:xgrid
        U(j,i)=w(k);
        k=k+1;
    end
end

error Unbalanced or unexpected parenthesis or bracket in "w=sym('w',[1(xgrid-1)*(ygrid-1)]);"

Please Help!!