title: Combining two "1D vertical" dataframes into a "2D" dataframe
body: <p>I am trying to submit a data column into a signal processing engine that requires a timestamp with each row of data. Picture two columns in Excel - calculated timestamp in the left column and data in the right column. So I now have two dataframes that are each 1 cell by 27k cells long. The data doesn't have a common key between them so they don't need to be aligned. How can I combine them into a single "two column wide by 27k rows long" dataframe?</p>