Actual Symbol Output for Predictions

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Hello!

I found this tutorial a couple of days ago, and I'm just getting into R and modeling. I've got a few basic examples up and running, but I can't figure out how to output an actual prediction. So in your code, it tries to predict which stock's volume will go up tomorrow, right? But all I can get is the AUC score, and the predictions are just numbers not tied to a symbol.

After you have a model you like, how do you go about training on 100% of the data, and then outputting the predictions for tomorrow? I.e. it would output anything with a "1", so maybe AAPL, FISV and MMM.

Oh, and thanks for the awesome tutorial, everything else made perfect sense!