The output from MeasurementFcn must have the same size and data type as the given measurement.

I have Simulink model for feed axis driving system with an Intermediary Extended Kalman Filter (EKF) block, i have used mymeasurementfunc and myStateTransitionFcn as follows

x_hat = myStateTransitionFcn(x,u)

Ts = 0.001;

x_hat = x+[x(2); x(2)*((-K2-c)/P)+((K1*u)/P)]*Ts; %state equation

end

function y =mymeasurementfunc(x)

y = x(1);

end

while executing this i am getting error as The output from MeasurementFcn must have the same size and data type as the given measurement.