how to finde state estimation error?

2016 1 24
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I used ode command to find actual states of differential equation as this?
[t,x]= ode45(@exam3f,[Initial_Time Final_Time], [0.01 0.5 0.01 0.5 0.01 0.5 1] );
and the estimated states are
[t1,x3]= ode45(@exam6f,[Initial_Time Final_Time], [0.01 0.5 0.01 0.5 0.01 0.5 1] );
when i want to find error between actual and estimated states
error= x-x3;
it gives an error dimensions not same.

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