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Change values while iterating
...is behavior is demonstrated by the following code:
x := make([]int, 3)
x[0], x[1], x[2] = 1, 2, 3
for i, val := range x {
println(&x[i], "vs.", &val)
}
The code prints you completely different memory locations for the value from range and the actual
value in the slice:
0xf84000f0...
Quickly reading very large tables as dataframes
I have very large tables (30 million rows) that I would like to load as a dataframes in R. read.table() has a lot of convenient features, but it seems like there is a lot of logic in the implementation that would slow things down. In my case, I am assuming I know the types of the columns ahead o...
How to do math in a Django template?
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You can use the add filter:
{{ object.article.rating_score|add:"-100" }}
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How do I output the difference between two specific revisions in Subversion?
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See svn diff in the manual:
svn diff -r 8979:11390 http://svn.collab.net/repos/svn/trunk/fSupplierModel.php
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What does the double colon (::) mean in CSS?
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Salman A
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answered May 23 '13 at 1:05
alexalex
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Dealing with float precision in Javascript [duplicate]
... IEEE 754 can exactly represent integers up to something like 2^50. So, if you're working within a known range, you can scale your values to take advantage of the 50 bits (or whatever) of precision, instead of wasting the precision normally reserved for large numbers.
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How can I add remote repositories in Mercurial?
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130
You add entries to the [paths] section of your local clone's .hg/hgrc file. Here's an example o...
What does the `#` operator mean in Scala?
...t; val a1 = new A
a1: A = A@1497b7b1
scala> val a2 = new A
a2: A = A@2607c28c
scala> a2.f(new a1.B)
<console>:11: error: type mismatch;
found : a1.B
required: a2.B
a2.f(new a1.B)
^
scala> a2.g(new a1.B)
Got a B.
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Do using statements and await keywords play nicely in c#
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– swingdoctor
May 15 '13 at 16:06
@JonSkeet Should await even be used inside a using(){...} block or it's an over...
LINQ Using Max() to select a single row
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edited Jul 5 '13 at 13:08
answered Feb 2 '12 at 15:30
Da...