December 2018
Beginner to intermediate
500 pages
12h 10m
English
Content preview from Julia Programming Projects
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The when() method
The when method allows for aggregating elements from a TimeArray into specific time periods. For instance, we can use this function to pick the Wednesdays in our dataset in a more concise fashion:
julia> when(MarketData.ohlc[1:70], Dates.dayname, "Wednesday")
14x4 TimeArray{Float64,2,Date,Array{Float64,2}} 2000-01-05 to 2000-04-05
# output truncated
We are not limited to just Dates.dayname; we can use many of the Dates functions we covered in the previous section—day, dayname, week, month, monthname, year, dayofweek, dayofweekofmonth, dayofyear, quarterofyear, and dayofquarter:
julia> when(MarketData.ohlc, Dates.monthname, "August") 46x4 TimeArray{Float64,2,Date,Array{Float64,2}} 2000-08-01 to 2001-08-31 # output truncated ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.