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Add legend to ggplot2 line plot
...o find a fix to the issue I bought up earlier re: colour ordering. use the form scale_colour_manual("", values = c("TempMax" = "red", "TempMedia" = "green", "TempMin" = "blue")) where TempMax, TempMedia and TempMin are specified as the colour argument as in the answer above.
– ...
Difference between __str__ and __repr__?
...just work. This is why the “eval” thing comes up: if you have enough information so eval(repr(c))==c, that means you know everything there is to know about c. If that’s easy enough, at least in a fuzzy way, do it. If not, make sure you have enough information about c anyway. I usually use an e...
What is the difference between inversedBy and mappedBy?
...TRINE engine to reduce the number of SQL queries it has to do to get the information you need. To be clear if you don't add inversedBy or mappedBy your code will still work but will not be optimized.
So for example, look at the classes below:
class Task
{
/**
* @var int
*
* @OR...
How to avoid “if” chains?
...arrow anti-pattern. It is called an arrow because the chain of nested ifs form code blocks that expand farther and farther to the right and then back to the left, forming a visual arrow that "points" to the right side of the code editor pane.
Flatten the Arrow with the Guard
Some common ways of...
Unpacking, extended unpacking and nested extended unpacking
... might find it easier to understand an expression if all the iterables are formatted in the same way.
For the purposes of unpacking only, the following substitutions are valid on the right side of the = (i.e. for rvalues):
'XY' -> ('X', 'Y')
['X', 'Y'] -> ('X', 'Y')
If you find that a valu...
How is “=default” different from “{}” for default constructor and destructor?
...n the default constructor for T is called (and the
initialization is ill-formed if T has no accessible default
constructor);
— if T is a (possibly cv-qualified) non-union class type
without a user-provided constructor, then the object is
zero-initialized and, if T’s implicitly-decl...
Solving “Who owns the Zebra” programmatically?
...lk, pallmall )
h( green, german, zebra, coffee, prince ) % (* formatted by hand *)
h( white, swede, dog, beer, bluemaster)
no more solutions!
% (* 1,706 inferences, 0.000 CPU in 0.070 seconds (0% CPU, Infinite Lips) *)
true.
...
Why not be dependently typed?
... you: it repeats standard myths as fact. Edwin Brady's language, Idris, performs type erasure (because no run-time behaviour depends on types) and generates a fairly standard lambda-lifted supercombinator encoding from which code is generated using stock G-machine techniques.
–...
How do I give text or an image a transparent background using CSS?
...
@grm: W3C considered introducing a #RRGGBBAA hex code format, but they decided not to (for various reasons), so we can't.
– outis
Dec 15 '12 at 6:59
95
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In Functional Programming, what is a functor?
...xample of implementation and practical use, you could define your favorite form of balanced binary search tree once and for all as a functor, and it would take as a parameter a module that provides:
The type of key to be used in the binary tree
A total-ordering function on keys
Once you've done ...