In case anyone else is interested, I found using evalhf in place of evalf helped. That ensured there was nothing symbolic remaining.

In case anyone else is interested, I found using evalhf in place of evalf helped. That ensured there was nothing symbolic remaining.

Thanks for that quick response - and a useful one!

Indeed the matrix I pass to Eigenvalues is purely numeric - but perhaps doing an evalf as you suggest will help. 

I didn't know about fnormal - that's a very useful hint (one of the matrices is symmetric, and I was just taking the real part of the eigenvlaues).

Thanks again

James

Thanks for that quick response - and a useful one!

Indeed the matrix I pass to Eigenvalues is purely numeric - but perhaps doing an evalf as you suggest will help. 

I didn't know about fnormal - that's a very useful hint (one of the matrices is symmetric, and I was just taking the real part of the eigenvlaues).

Thanks again

James