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How do I use a recorded variable to generate signals?

My problem here is the following:

My trading signal is based on historical values of a portfolio of futures. The weights of the portfolio are time-varying. I understand I can use the record function to record it on a daily basis for plotting purpose. But I am wondering if it is possible to access the history of this recorded variable, say, to calculate the moving average.

I am a total newbie here. The record function might not be suitable for this purpose at all. But can anyone help give me a direction on how to "save" the variable and access its history in the future.

Thanks a lot for your help!