Can we Edit RINEX Files using Matlab?

Hi,

I have GPS data in RINEX files. My goal is to study the variations in position by changing the values of Ephemeris. I have already varied Ephemeris data in matlab and the plot is showing variation in position. However, I want to know plot the data on google earth and see the position difference.

The problem is, I have more than 5k epocs in my data and changing the values manually is almost an impossible task. Is there any way to alter the data using Matlab?