refined matlab problem...

Hi people ,
I posted a comment yesterday and i dont think i was specific enough. I have data from excel, its basically just 2 columns of data, one for the x-axis and one for the y axis when plotted. I have managed to upload this dats into excel and then using commands like x=data(:,1),y=data(:,2) have managed to plot this and it does give the graph i want. Thats fine...now i want to take this data and carry out a hilbert transform on this so i can see the real and imaginary parts. only think is i am having problems when trying to carry out the transform on the excel data. Any one know what i can do or have any code i can try.

Thanks again,

Stuart :D