Matlab - codigo compresion de señal digital grafica

function[n,x]=comprimir(t,x,c)

n1= mod(t,c)

k=0

for i=1;length(n1)

    if n1(i)==0

        n2=n1(i)/c

        k=k+1

        n3(k)=n2

        x3(k)=x(i)

    end

end

n= n3

x= x3

for i=1:length(n1)