vector multiplication with its transpose

Hi experts,

I have question about an inequality how to implement in matlab??

the simple is that (y(t+1)-y(t))'W(y(t+1)-y(t))>y(t)'Wy(t)? Can I use a norm function for this?

Answer 1

[James Tursa]

Variables and expressions in MATLAB need an operator between them ... there is no implied multiply. So this

(y(t+1)-y(t))'W(y(t+1)-y(t))>y(t)'Wy(t)

should be this instead

(y(t+1)-y(t)).' * W * (y(t+1)-y(t)) > y(t).' * W * y(t)

[Muhammad Atif]

Thanks sir, but my question is about can I use a norm function here? i.e. y(t)*y(t)=Norm (y)

[Muhammad Atif]

y(t)'*y(t)

[James Tursa]

For a numeric column vector, norm(y(t)) would give the same result as sqrt(y(t)' * y(t)) if that is what you are asking.

How is this being used? Are these numeric or symbolic?

[Muhammad Atif]

yes it is numeric, but it is a row vector