[Python] Is there a 2-D "where" in numpy?

This might seem an odd question, but it boils down to quite a simple operation that I can't find a numpy equivalent for. I've looked at np.where as well as many other operations but can't find anything that does this:

a = np.array([1,2,3])
b = np.array([1,2,3,4])
c = np.array([i<b for i in a])


The output is a 2-D array (3,4), of booleans comparing each value.

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