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What does .SD stand for in data.table in R
...al-world feel, rather than making up data, let's load some data sets about baseball from Lahman:
library(data.table)
library(magrittr) # some piping can be beautiful
library(Lahman)
Teams = as.data.table(Teams)
# *I'm selectively suppressing the printed output of tables here*
Teams
Pitching = as.d...
How to tell if JRE or JDK is installed
...uires parsing the output (e.g. 2>&1 |grep -v "Unable") which varies based on locale.
Note, Java may also exist in /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home/bin, but at time of writing this, I'm unaware of a JRE that installs there which contains javac as well.
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Memcached vs. Redis? [closed]
... useful as a cache. Both can help speed up your application by caching database results, HTML fragments, or anything else that might be expensive to generate.
Points to Consider
When used for the same thing, here is how they compare using the original question's "Points to Consider":
Read/write spe...
How to handle screen orientation change when progress dialog and background thread active?
...oyed "because any application resource, including layout files, can change based on any configuration value. Thus the only safe way to handle a configuration change is to re-retrieve all resources". And besides orientation, there are many more reasons for the configuration to change: keyboardHidden ...
What's the point of the X-Requested-With header?
...s. And you use a custom jQuery framework to slide recipes into a container based on a link they click.
The link may be www.example.com/recipe/apple_pie
Now normally that returns a full page, header, footer, recipe content and ads. But if someone is browsing your website some of those parts are alre...
Git pull without checkout?
...al master workspace, then switch again to a feature branch and perform a rebase to make it up-to-date with master.
To make this all done, keep the workspace on feature branch and avoid all the switching, I do this:
git fetch origin master:master
git rebase master
And it does the trick nicely.
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Parse usable Street Address, City, State, Zip from a string [closed]
Problem: I have an address field from an Access database which has been converted to Sql Server 2005. This field has everything all in one field. I need to parse out the individual sections of the address into their appropriate fields in a normalized table. I need to do this for approximately 4,000 ...
What is a PDB file?
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PDB is an abbreviation for Program Data Base. As the name suggests, it is a repository (persistent storage such as databases) to maintain information required to run your program in debug mode. It contains many important relevant information required while you debu...
When is localStorage cleared?
...es include techniques involving query strings, hidden form
fields, flash based local shared objects, etc. Each with their own set
of problems related to security, ease of use, size restrictions etc.
So up until now we have been using pretty bad ways of storing data on
the user’s end. We ne...
Remove Select arrow on IE
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@MarcRoussel based on this fiddle this can be written like select:hover::-ms-expand hover state for pseudo element is as mentioned selector:state::pseudo. I couldn't test with IE yet worth a try :)
– Praveen
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