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How to sort a list in Scala by two fields?
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In general, if you use a stable sorting algorithm, you can just sort by one key, then the next.
rows.sortBy(_.firstName).sortBy(_.lastName)
The final result will be sorted by lastname, then where that is equal, by firstname.
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Error: could not find function … in R
...tains the function? install.packages("thePackage") (this only needs to be done once)
Did you attach that package to the workspace ?
require(thePackage) or library(thePackage) (this should be done every time you start a new R session)
Are you using an older R version where this function didn't exist...
Securely storing environment variables in GAE with app.yaml
..., your keys will show up. They will all have the value NOT SET. Click each one and set its value.
Hope this helps!
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facebook: permanent Page Access Token?
I work on a project that has facebook pages as one of its data sources. It imports some data from it periodically with no GUI involved. Then we use a web app to show the data we already have.
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What is a “symbol” in Julia?
...ll this "homoiconicity" (Wikipedia), but others don't seem to think that alone is sufficient for a language to be homoiconic. But the terminology doesn't really matter. The point is that when a language can represent its own code, it needs a way to represent things like assignments, function calls, ...
How to remove all callbacks from a Handler?
...andled after the activity has lost focus. But depends on what needs to be done when the callback/message is fired
– Boy
Aug 24 '14 at 13:08
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Why can't non-default arguments follow default arguments?
...re allowed.</q> Ruby allows non-default arguments following default ones. <q>How you will suggest the assignment of variables in the function call</q> Just use func1(x=1, y=2).
– weakish
Dec 9 '14 at 12:15
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Are SVG parameters such as 'xmlns' and 'version' needed?
...rsion...) for the version attribute of the <svg> element. The first one is about the version of the XML markup language, while the latter one specifies the version of SVG. The author of this answer made that mistake by refering to the XML, not the SVG specification in ³. I tried to correct i...
What's the difference between Application.ThreadException and AppDomain.CurrentDomain.UnhandledExcep
Alright, this is an easy one:
4 Answers
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Define make variable at rule execution time
...ot in order of the rule procedures. In other words, $(eval ...) happens sooner than you think. While that might be okay for this example, this method will cause problems for some sequential operations.
– JamesThomasMoon1979
Jun 11 '15 at 2:53
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