unexpected behavior with symbolic substitution, 0 in vector

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.

Answer 1

[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.

Answer 2

[Tonkma]

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.