How to plot streamlines using Streamslice?

Hey there, I'm trying to generate a streamline plot but I keep getting an error message saying something is wrong at line 14. Can anybody help?

edit: Sorry, I forgot to mention that the streamlines vary with time so I'll probably be recording multiple plots

Answer 1

[KSSV]

[X,Y] = meshgrid(-5:0.1:5,-5:0.1:5) ;
u = X.*(1+2*Y) ;
v = Y ; 
streamslice(X,Y,u,v)

Answer 2

[Kelvin Ang]

So I think I may have figured it out

clc; clear all; close all

syms x y u v t c

u(x,y,t) = x*(1+2*t); %defined as a function of x, y, and t since streamline is time varying in this case
v(x,y,t) = y;

St = int(u,y)==int(v,x)

St(x, y, t) = 

figure(1) %for plotting the streamlines
[x y] = meshgrid(-5:0.1:5 -5:0.1:5);
t = 0;
u2 = u(x,y,t); %remember to keep "t"
v2 = v(x,y,t);
streamslice(x,y,u2,v2)
title('t = 0') %rinse and repeat for as many time intervals as needed
xlabel('x')
ylabel('y')

figure(2)
[x y] = meshgrid(-5:0.1:5 -5:0.1:5);
t = 0.5;
u2 = u(x,y,t); 
v2 = v(x,y,t);
streamslice(x,y,u2,v2)
title('t = 0.5')
xlabel('x')
ylabel('y')