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How to fix the uninitialized constant Rake::DSL problem on Heroku?
...in the Gemfile to get around the version 0.9.2 Rake::DSL problem.
After I converted the app to Rails 3.2.0 (Heroku Cedar stack), I was having a problem with the worker (a rake task) crashing. I changed "gem 'rake', '0.8.7'" to "gem 'rake'", which bundled rake version 0.9.2.2. The worker stopped cra...
Good example of livelock?
... = d; }
public synchronized void use() {
System.out.printf("%s has eaten!", owner.name);
}
}
static class Diner {
private String name;
private boolean isHungry;
public Diner(String n) { name = n; isHungry = true; }
public...
Fixed point vs Floating point number
I just can't understand fixed point and floating point numbers due to hard to read definitions about them all over Google. But none that I have read provide a simple enough explanation of what they really are. Can I get a plain definition with example?
...
What is @ModelAttribute in Spring MVC?
...request using the request.getParameter method.
once it reads them, it will convert them into the appropriate Java type using integer.parseInt, double.parseDouble and all the other parse methods that are available based on the data type of the data.
once parsed, it will create a object of the model ...
What is the difference between __dirname and ./ in node.js?
... of __dirname , and essentially want to know whether it would be smart to convert my ./'s to that, and if so, why that would be a smart idea.
...
What is Gradle in Android Studio?
... .xml), then applies the appropriate tool (e.g. takes java class files and converts them to dex files), and groups all of them into one compressed file, our beloved APK.
This build system uses some conventions: an example of one is to specify the directory containing the source files (in Eclipse it...
What guarantees are there on the run-time complexity (Big-O) of LINQ methods?
...inct, GroupBy Join, and I believe also the set-aggregation methods (Union, Intersect and Except) use hashing, so they should be close to O(N) instead of O(N²).
Contains checks for an ICollection implementation, so it may be O(1) if the underlying collection is also O(1), such as a HashSet<T>,...
android splash screen sizes for ldpi,mdpi, hdpi, xhdpi displays ? - eg : 1024X768 pixels for ldpi
... C:\Program Files (x86)\Android\android-studio\sdk\tools\draw9patch.bat to convert a 9-patch file. For that open your splash screen on draw9patch app. You should define your logo and expandable areas. Notice the black line the following example splash screen. The black line's thickness is just 1 px ...
Referencing a string in a string array resource with xml
...'t think you can, but there seems to be a workaround:.
If you take a look into the Android Resource here:
http://developer.android.com/guide/topics/resources/string-resource.html
You see than under the array section (string array, at least), the "RESOURCE REFERENCE" (as you get from an XML) does ...
dplyr summarise: Equivalent of “.drop=FALSE” to keep groups with zero length in output
...)
#> # A tibble: 3 x 2
#> b count_a
#> <fct> <int>
#> 1 1 6
#> 2 2 6
#> 3 3 0
One additional note to go with @Moody_Mudskipper's answer: Using .drop=FALSE can give potentially unexpected results when one or more grouping variab...