How can I write data from an Android's sensors to a document that I can access later?

Question

So I'm creating a project on an Android Galaxy Tab 10.1 that uses its accelerometers and gyroscopes. One of the steps here is to collect alot of data and determine its accuracy and drift. To do this I need to move the device and allow the sensors to get their readings, and then take those readings and put them through some analysis.

My admittedly primitive way of doing this is to send each reading as an error to the log, copy the log from Eclipse, paste it in notepad, and format it, getting rid of other unwanted errors and timestamps. This method is not very good, and the log in Eclipse deletes the old log entries if the list gets too long, meaning I can only look at about 30 seconds of data.

I need much more time than this so I thought of a couple ways to fix the issue:

1. If I could somehow write the readings directly from the Android to a document on the computer im using, that would solve all my problems.
2. If i could write the readings to a file on the Android that could be saved and later transfered to the computer, that would also work