In need of a specific statistic test

Hi,

I am looking for a single-tailed, paired, non-parametric statistic test.

Specifically, I have (Xi,Yi) pairs and I want to know whether X is consistently larger than Y, or vica versa, in a significant manner (i want to be able to quantify the significance either way).

Is there such a thing implemented in Matlab? Ranksum and signrank are close to what i need but are both two-tailed.

Thanks!

Shay