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How to convert a unix timestamp (seconds since epoch) to Ruby DateTime?
...n):047:2> end
irb(main):048:1> end
=> #<Benchmark ... @real=2.0e-05 ... @total=0.0>
irb(main):050:0* Benchmark.measure do
irb(main):051:1* ["1318996912", "1318496912"].each do |s|
irb(main):052:2* Time.at(s.to_i).to_datetime
irb(main):053:2> end
irb(main):054:1> end
...
get list from pandas dataframe column
...ntype:{type(col_one_arr)}")
Output:
DataFrame:
one two
a 1.0 1
b 2.0 2
c 3.0 3
d NaN 4
column types:
one float64
two int64
dtype: object
col_one_list:
[1.0, 2.0, 3.0, nan]
type:<class 'list'>
col_one_arr:
[ 1. 2. 3. nan]
type:<class 'numpy.ndarray'>
...
R command for setting working directory to source file location in Rstudio
I am working out some tutorials in R. Each R code is contained in a specific folder. There are data files and other files in there. I want to open the .r file and source it such that I do not have to change the working directory in Rstudio as shown below:
...
.NET data structures: ArrayList, List, HashTable, Dictionary, SortedList, SortedDictionary — Speed,
...t of the collections are duplicates because generics were added in version 2.0 of the framework.
So, although the generic collections likely add features, for the most part:
List is a generic implementation of ArrayList.
Dictionary is a generic implementation of Hashtable
Arrays are a fixed s...
Difference between '..' (double-dot) and '…' (triple-dot) in range generation?
...s.
>> (-1..2).step(0.5).to_a
=> [-1.0, -0.5, 0.0, 0.5, 1.0, 1.5, 2.0]
>> (-1...3).step(0.5).to_a
=> [-1.0, -0.5, 0.0, 0.5, 1.0, 1.5, 2.0, 2.5]
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proper hibernate annotation for byte[]
...nds on what you want. JPA can persist a non annotated byte[]. From the JPA 2.0 spec:
11.1.6 Basic Annotation
The Basic annotation is the simplest
type of mapping to a database column.
The Basic annotation can be applied
to a persistent property or instance
variable of any of the fo...
How to render a PDF file in Android
...er library, it is very fast and easy to use, licensed under Apache License 2.0:
pdfView.fromAsset(String)
.pages(0, 2, 1, 3, 3, 3) // all pages are displayed by default
.enableSwipe(true)
.swipeHorizontal(false)
.enableDoubletap(true)
.defaultPage(0)
.onDraw(onDrawListener)
.onLoad(on...
SignalR - Sending a message to a specific user using (IUserIdProvider) *NEW 2.0.0*
.... This depends on how you identify a user in your application.
In SignalR 2.0, this is done by using the inbuilt IPrincipal.Identity.Name, which is the logged in user identifier as set during the ASP.NET authentication.
However, you may need to map the connection with the user using a different id...
How to pip install a package with min and max version range?
...
@Mike'Pomax'Kamermans You should use ~=2.2.0 in that case(* operator will not work if you're using ~=). 2.2 and 2.2.0 (and 2.2.0.0, and so on) are internally handled as same thing when it comes to installing packages.
– ik1ne
M...
How to use bootstrap-theme.css with bootstrap 3?
...at all, it only enhances the appearance.
Update 2
With the release of v3.2.0 Bootstrap have added an option to view the theme css on the doc pages. If you go to one of the doc pages (css, components, javascript) you should see a "Preview theme" link at the bottom of the side nav which you can use ...