Great question! I don't have an example dataflow for this right now, but can provide you with high-level steps to accomplish this today and long-term plan.
Today: You can create a user-defined function (UDF) to perform your matrix multiplication. Here's how it would work:
1. Write a UDF to use a Python library, like Numpy, to format variables, execute the multiplication, and format output for storage in a new column.
2. Use the MAP operator to define a new column using the UDF and other columns (containing matrices) as inputs.
Long term: There is an extension currently in development which should be released within the next 2 weeks. I will confirm delivery timeline and follow-up on this thread with a firm ETA, when I have one.