September 2013
Intermediate to advanced
114 pages
2h 51m
English
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Recipe 7 – transposing rows and columns
Sometimes data is not arranged into rows and columns the way you like. Indeed, there are different ways of arranging what belongs where, and the choices depend on the situation. In the Powerhouse Museum dataset, for instance, there are separate columns for several dimensions: Height, Width, Depth, Diameter, and Weight. However, not many objects have data for these columns, so the cost of maintaining them might be high with respect to the value they add. An alternative would be to transform these five columns into two columns: one that contains the name of the dimension (for instance, Height or Weight) and another that contains the measurement (for instance, 35mm or 2kg).
What we want to do here is to transpose ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.