trap errors individually in calculation of vector/matrix

Hi,

say I have a vector v with possible zero valued elements and I want log(v), is there an efficient way to get Mathcad to trap errors individually? In my case I simply want to return a predetermined constant -ve value for all zero elements.

At the moment I have something like "-100 on error log(v)" which returns a scalar if any element is zero rather than a vector. I know I could loop through but this might be slow since some of my arrays are quite big.

Regards,

D