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

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nazim siddique
nazim siddique 2016-3-18
评论： Walter Roberson 2016-3-18
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)

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回答（1 个）

Ced
Ced 2016-3-18
编辑：Ced 2016-3-18
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.
  2 个评论
nazim siddique
nazim siddique 2016-3-18
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
Walter Roberson 2016-3-18
You did not indicate which line the error is being reported on.
What is the output of
which tf2ss
which ss
which logical

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