how to remove error from this code

a = 1000;
a = randi([-1 1],a,1);
b= (a >= 0);
bm=(a<0);
b1(b)=1;
b1(bm)=-1;
d=b1(:);
h=[1 0.25 -0.5];
c=conv(h,d);
e=c(1:end-2,:);
noise1 =normrnd(0,0.1,[length(e)],1); % noise signal of zero mean and 0.1 variance
f1=e+noise1;
t=f1(1:end-990,:); %take 10 values 
ss = 16; % NLMS step size
offset = 50; % NLMS offset
ha = adaptfilt.nlms(3,ss,1,offset);
stem([h', ha.coefficients']);
legend('Actual','Estimated'); 
xlabel('Coefficient number'); ylabel('Coefficient Value');
l=deconv(f1,ha.coefficients);
idmax = (l > 0);
idmin = (l < 0);
l1(idmax) = 1;
l1(idmin) = -1;
ll=[l1 0 0];
Y1 = ll(:);
p1=0;
q1=0;
for i=1:1000
if(ll(i)==d(i))
p1=p1+1;
else
q1=q1+1;
end
end
pe1=(q1/1000);

[Geoff Hayes]

What is the error message? Please copy and paste the full error message (all the text in red) to your question.

[Walter Roberson]

You appear to have one variable named l1 and another named ll. That is legal but it is hard on the readers whose vision is no longer perfect.

[Image Analyst]

Do you mean this error:

Undefined variable "adaptfilt" or class "adaptfilt.nlms".
Error in test1 (line 16)
ha = adaptfilt.nlms(3,ss,1,offset);

If so, it's probably that you don't have the proper toolbox installed.