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Dynamically select data frame columns using $ and a character value
...ldname)) {
print("Bad file column name")
}
# Here we use the hash table implementation where
# we have a string key and list value so we need actual strings,
# not Factors
file[cptcodefieldname] = as.character(file[cptcodefieldname])
file[icdcodefieldname] = as.character(file[icdcodefieldn...
Convert date to datetime in Python
...That is because what it does is first retrieving the minimum value representable by datetime and then getting its time component. Incidentally, datetime.min = datetime(MINYEAR, 1, 1, tzinfo=None) and has a time of 00:00:00. However, I think it is cleaner to explicitly create a 00:00:00 time either t...
Socket 错误返回码详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...tion is indicating a problem with one or more parameters.
WSAINVALIDPROCTABLE (OS dependent) Invalid procedure table from service provider.
A service provider returned a bogus proc table to WS2_32.DLL. (Usually caused by one or more of the function pointers being NULL.)
WSAINVALIDPROVIDER ...
Pros and Cons of Interface constants [closed]
...a great solid design. But there are times when good enough really is acceptable (and it takes an experienced developer to understand the difference), and in those cases it's fine.
Again, that's just my view on it...
share
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What are best practices that you use when writing Objective-C and Cocoa? [closed]
...lass? That is especially true in an environment like the iPhone.
3.5) In table cells, make every element (including the cell itself) opaque for performance. That means setting the appropriate background color in everything.
3.6) When using an NSURLConnection, as a rule you may well want to implem...
MySQL Database won't start in XAMPP Manager-osx
...l.err, if you find something like: "Attempted to open a previously opened tablespace. Previous tablespace ... uses space ID"
the following works for me:
edit file:
/Applications/XAMPP/xamppfiles/etc/my.cnf
find the [mysqld] section, add one line:
innodb_force_recovery = 1
then run
sudo /Appl...
Rails 4 multiple image or file upload using carrierwave
...t saying it wouldn't be possible, I'm just saying it would be ugly. A join table is a much better idea.
– Toby 1 Kenobi
Mar 11 '16 at 1:12
3
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JQuery: 'Uncaught TypeError: Illegal invocation' at ajax request - several elements
...t in my php code I need that value as a foreign key for querying my cities table and filter correct entries).
So, instead of:
var data = {
'mode': 'filter_city',
'id_A': e[e.selectedIndex]
};
it should be:
var data = {
'mode': 'filter_city',
'id_A': e[e.selectedI...
how to find host name from IP with out login to the host
...server(s), so it's common to see the same hostnames in a DHCP client least table and in the DNS server's A (or AAAA for IPv6) records. Again, this is usually done as part of zeroconf.
Also note that just because a DHCP lease exists for a client, doesn't mean it's still being used.
NetBIOS for TCP/...
How do I truncate a .NET string?
...t its length is not longer than a given value. I am writing to a database table and want to ensure that the values I write meet the constraint of the column's datatype.
...