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Add a common Legend for combined ggplots
...legend(p1)
p3 <- grid.arrange(arrangeGrob(p1 + theme(legend.position="none"),
p2 + theme(legend.position="none"),
nrow=1),
mylegend, nrow=2,heights=c(10, 1))
Here is the resulting plot:
...
Physical vs. logical / soft delete of database record?
... have unique indexes on the table, deleted records will still take up the "one" record, so you have to code around that possibility too (for example, a User table that has a unique index on username; A deleted record would still block the deleted users username for new records. Working around this ...
C/C++ with GCC: Statically add resource files to executable/library
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One downside to this approach is that some compilers can't handle such enormous static arrays, if your images are particularly big; the way to get around that is, as ndim suggests, to use objcopy to convert the binary data di...
Create singleton using GCD's dispatch_once in Objective-C
...ingleton is not a certainty of its immortality, but certainty that we have one instance. What if that singleton decrement a semaphore? You can't just arbitrary say that it will always exists.
– jacekmigacz
Jan 25 '13 at 13:40
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How to improve performance of ngRepeat over a huge dataset (angular.js)?
...isplay only a limited amount of rows, faster and better UX, this could be done with a pagination or with an infinite scroll.
Infinite scroll with Angular is really simple with limitTo filter. You just have to set the initial limit and when the user asks for more data (I am using a button for simpli...
MySQL Insert into multiple tables? (Database normalization?)
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No, you can't insert into multiple tables in one MySQL command. You can however use transactions.
BEGIN;
INSERT INTO users (username, password)
VALUES('test', 'test');
INSERT INTO profiles (userid, bio, homepage)
VALUES(LAST_INSERT_ID(),'Hello world!', 'http://www...
Use ffmpeg to add text subtitles [closed]
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This method add subtitle to file as one of stream, so need player support to show subtitle(such as VLC)
– BollMose
Sep 28 '15 at 7:59
1
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C++0x has no semaphores? How to synchronize threads?
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You can easily build one from a mutex and a condition variable:
#include <mutex>
#include <condition_variable>
class semaphore
{
private:
std::mutex mutex_;
std::condition_variable condition_;
unsigned long count_ = 0; /...
Exposing database IDs - security risk?
...st danger is what OWASP called "insecure direct object references." If someone discovers the id of an entity, and your application lacks sufficient authorization controls to prevent it, they can do things that you didn't intend.
Here are some good rules to follow:
Use role-based security to control...
Unit Testing C Code [closed]
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One unit testing framework in C is Check; a list of unit testing frameworks in C can be found here and is reproduced below. Depending on how many standard library functions your runtime has, you may or not be able to use one...