# Anyone knows what I'm doing wrong with my table?

I got the error !Package array Error: Illegal prem-token (o): c' used. Don't know how to solve this problem. My table has only one row.

$$\xi = \left\{\begin{array} {cols}X\\Y\\\varphi\\v_x\\v_y\\\omega\end{array}\right\}, u = \left\{\begin{array}{cols}D\\\delta\end{array}\right\}$$

• There seems to be a mismatch between the title and first paragraph of your write-up, with refer to a "table" that consists of a single row, and the code, which employs 2 array environments which contain one column vector each. Please clarify and/or edit your posting as needed.
– Mico
Oct 7 '17 at 16:16

The two instances of the statement

\begin{array}{cols}


are not syntactically valid: LaTeX knows about the c and l column types, but nothing about column types called o and s.

Since the bodies of the two array environments appear to be column vectors, you should be writing

\begin{array}{c}
`

in both instances.