Error: Indexing with parentheses '()' must appear as the last operation of a valid indexing expression??

Why does the following for loop produce the error "Indexing with parentheses '()' must appear as the last operation of a valid indexing expression"?

data matrix (1000x4)

Pass = [];
for i = 1:size(xt)
    for j = 1:size(x)
        if (sqrt((x(j,1)-xt(i,1)^2)+(y(j,1)-yt(i,1))^2))<2
            if (ismember(j,Pass)(1)==0)
                Pass = [Pass j];
            end
        end
    end
end
disp(Pass);

Answer 1

[Cris LaPierre]

What do you want this line to do?

ismember(j,Pass)(1)==0

The (1) is causing the problem. Did you intend to do this instead?

ismember(j,Pass)==0

[Naruto]

Yes! Thanks Cris!