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Git alias with positional parameters
... dangerous in general). Also, a function is unnecessary. See my answer for more explanation.
– Tom Hale
Sep 16 '16 at 3:56
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“Undefined reference to” template class constructor [duplicate]
...o_colaypila.cpp into cola.h and nodo_colaypila.h. In the long run, this is more flexible as it means you can use extra instantiations (e.g. cola<char>) without any more work. But it could mean the same functions are compiled many times, once in each translation unit. This is not a big problem,...
Git undo changes in some files [duplicate]
...uires the use of the rebase -i command. This one can be useful if you have more than one commit to edit:
# use rebase -i to cherry pick the commit you want to edit
# specify the sha1 of the commit before the one you want to edit
# you get an editor with a file and a bunch of lines starting with "pi...
No Multiline Lambda in Python: Why not?
...guously work with multilines.
This is just a simple one, there's probably more examples.
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What is the purpose of setting a key in data.table?
...o be set on x. With the new on= argument from v1.9.6+, this is not true anymore, and setting keys is therefore not an absolute requirement here as well.
## joins using < v1.9.6
setkey(X, a) # absolutely required
setkey(Y, a) # not absolutely required as long as 'a' is the first column
X[Y]
##...
Read entire file in Scala?
...o thank you for turning scala.io into something decent and worthy. I'll be more vocal in my thanks from now on, but I still hate the name, sorry.
– Daniel C. Sobral
Aug 26 '09 at 17:50
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Image comparison - fast algorithm
...om points is picking 100 important points. Certain parts of an image have more information than others (particularly at edges and corners), and these are the ones you'll want to use for smart image matching. Google "keypoint extraction" and "keypoint matching" and you'll find quite a few academic ...
When to use single quotes, double quotes, and backticks in MySQL
...es are supported by MySQL for string values as well, but single quotes are more widely accepted by other RDBMS, so it is a good habit to use single quotes instead of double.
MySQL also expects DATE and DATETIME literal values to be single-quoted as strings like '2001-01-01 00:00:00'. Consult the Dat...
How to do an update + join in PostgreSQL?
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Let me explain a little more by my example.
Task: correct info, where abiturients (students about to leave secondary school) have submitted applications to university earlier, than they got school certificates (yes, they got certificates earlier, t...