# symbolic vector norm

I can't get Sage to produce the norm or even just compute `w[1]^2`

in the code below. I keep getting a "not implemented" error. Have I made a simple mistake here, or is there a way around this? Thanks for the help. I haven't done much with matrix computations in Sage yet and am trying to learn my way around.

```
var('x,y')
a=matrix([[1,2],[-3,0]])
v=vector([x,y])
w=a*v.column()
w.norm()
```

This is an error in symbolic matrices (v.column() makes w a symbolic matrix, not a symbolic vector). I've opened a ticket here: http://trac.sagemath.org/experimental/ticket/12733

updated link