I am getting an error "Data 'hhatdot' is inferred as a variable size matrix, while its specified type is something else." My equation is "hhatdot =p*(u(t-hh​at)-u(t-h)​)*udot". So please can anyone help me with this.

function [hhatdot,bufferutnew] = fcn(ut,h,hhat,hmax,taus,udot,bufferut)
%#codegen
p = 0.05;

n=hmax/taus+1;
%%% updating input buffer 



bufferutnew=zeros(1,2001);

bufferutnew(1,1:n-1)=bufferut(2:n);
bufferutnew(1,n)=ut;

indicehhat=floor(hhat/taus+1);
indicehhat=n-indicehhat;

indiceh=floor(h/taus+1);
indiceh=n-indiceh;

hhatdot = p*(bufferutnew(indicehhat:n)-bufferutnew(indiceh:n))*udot;

hmax=2, taus=0.001, udot=d/dt(u(t-hhat)), h =0.5+0.25sin(2t) , ut is a control signal

[madhan ravi]

upload the datas

[Chiliveri Vinod]

i have uploaded