How to draw posterior traceplot when there are already samples?

Questions
1

I have samples from pymc3. No drawing at the time of sampling. Now I want to draw posterior without resampling.

How should I do this?

2

I guess it depends upon how you saved the trace at the time of sampling. pm.traceplot will not work if traces were saved as dataframes. Regardless, you can draw histograms of the saved traces to basically do the same thing that pm.traceplot does.