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unexpected behavior with symbolic substitution, 0 in vector

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Tonkma
Tonkma 2014-8-20
关闭： MATLAB Answer Bot 2021-8-20
Hi,
a simple example should show my problem. if i enter in Matlab R2012a:
syms l1y a
ka = [0;a];
subs(ka,l1y,0)
i would expect to get the unaltered vector
[0;a]
instead i get
[l1y;a]
is this a bug or i do i oversee something?
Thx for help.

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回答（2 个）

Salaheddin Hosseinzadeh
Hi Tonkma,
I think you got what you wrote :)
You defined ka as a column not row (vector), since you used ";" instead of ",". So change ka to
ka = [0,a]
Hopefully this will solve your prob.
Tonkma
Tonkma 2014-8-20
Hi Salaheddin,
thanks for fast response.
just now i had the possibility to test it on R2013b, there it works fine with column vectors.
so it looks like a bug in old version.

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