String into plot properties

Hello, how can I insert string into plot properties? For example I have cell u=[{'k*'}, {'k-'}] and I want plot(x, y, u(1)) but this shows 'Invalid first data argument'. Any solutions? Thank you very much.

[Rik]

Actually, it looks like the x is the first problem you're having. The second problem is that you're using matrix indexing to get a cell in your plot. You should use plot(x, y, u{1})

Answer 1

[Rene Riha]

Thank you, solution was type u={'ko', 'k-'}. Then it works.

[Rik]

You are aware that both syntaxes result in the same shape of the same data type?