MATLAB: Phase plotting symbolic system of equations (using ezplot and dsolve)

dsolveode

I'm trying to phase-plot (xsol by ysol) my system of odes:
% the uncoupled linear system
syms x(t) y(t)
A=diag([-1,2]); % creates diagonal matrix 
Y = [x; y];
odes = diff(Y) == A*Y;
[xSol(t), ySol(t)] = dsolve(odes);
xSol(t) = simplify(xSol(t))
ySol(t) = simplify(ySol(t))
ezplot(xSol(t),ySol(t))
but i get this error:
Error using sym/ezplot (line 53)
One parameter is expected when plotting a curve.
Error in equations (line 24)
ezplot(xSol(t),ySol(t))

Best Answer

You have to supply numeric (not symbolic) initial conditions:
[xSol(t), ySol(t)] = dsolve(odes, x(0)==1,  y(0)==1);
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