Reshaping a matrix?

I need to convert a 6 by 6 matrix to a 31 by 1 (vector), similarly to Matlab's [`reshape`](https://www.mathworks.com/help/matlab/ref/reshape.html). I'm currently trying to use [`fixed_resize`](http://nalgebra.org/rustdoc/nalgebra/base/struct.Matrix.html#method.fixed_resize) , but, as said in the documentation, it populates each missing row with the provided `val: f64`.

Is there currently a method provided to perform this?

Thanks