??? subscript indices must either be real positive integers or logicals

please help fixing this issue

numg = [1 2]
deng = [1 6 13 17 10 2]
[a,b,c,d] = tf2ss(numg,deng)
sys = ss(a,b,c,d)

Answer 1

[Ced]

I have no problem running this code. You probably have a variable called ss somewhere which overshadows the function of the same name. You need to rename or delete it.

Since a has negative elements, it tries to access negative elements of ss, and throws that error.

[nazim siddique]

there is no variable named ss in my code i think the original problem is with "a" i have tried using the command logical(a) but there is another error ??? index exceeds matrix dimensions

[Walter Roberson]

You did not indicate which line the error is being reported on.

What is the output of

which tf2ss
which ss
which logical