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Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
...trying to be set on a copy of a slice from a DataFrame. Try using .loc[row_indexer,col_indexer] = value instead." Should I be worried about that? pandas v.0.15
– taras
Oct 11 '14 at 21:31
...
Oracle 11.2.0.4 RAC FOR redhat 6.4 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...024
oracle hard nofile 65536
/etc/pam.d/login添加：
session required pam_limits.so
创建磁盘组
GRID 安装完成 在GRID 用户下输入asmca
创建 Flash_Recovery 盘组
所有盘组都创建完成后退出
开始安装oracle software
使用ora...
Why is my git repository so big?
...0/266720
git-eradicate (for video/parasite.avi):
git filter-branch -f --index-filter \
'git rm --force --cached --ignore-unmatch video/parasite-intro.avi' \
-- --all
rm -Rf .git/refs/original && \
git reflog expire --expire=now --all && \
git gc --aggressive &...
Is it possible to roll back CREATE TABLE and ALTER TABLE statements in major SQL databases?
... new foo table. (Edit: this was fixed in or before PostgreSQL 9.3)
CREATE INDEX ... CONCURRENTLY is exceptional, it uses three transactions to add an index to a table while allowing concurrent updates, so it cannot itself be performed in a transaction.
Also the database maintenance command VACUUM ...
How do you use NSAttributedString?
... for enum access (needed because enum can't use '-'):
func helveticaFont (index:Int) -> (String) {
let fontArray = [
"HelveticaNeue-Bold",
"HelveticaNeue-CondensedBlack",
"HelveticaNeue-Medium",
"HelveticaNeue",
"HelveticaNeue-Light",
"HelveticaNeue-CondensedBold",
...
How can I use Spring Security without sessions?
...sHandler">
<property name="defaultTargetUrl" value="/index.html"/>
<property name="passwordExpiredUrl" value="/changePassword.jsp"/>
<property name="alwaysUseDefaultTargetUrl" value="true"/>
</bean>
</p...
How to get an enum which is created in attrs.xml in code
...function:
inline fun <reified T : Enum<T>> TypedArray.getEnum(index: Int, default: T) =
getInt(index, -1).let { if (it >= 0) enumValues<T>()[it] else default
}
Now getting enum is simple:
val a: TypedArray = obtainStyledAttributes(...)
val yourEnum: YourEnum = a.getEnum...
What is a “surrogate pair” in Java?
...0,4) //"????????"
To solve this we can use String.offsetByCodePoints(int index, int codePointOffset)
"????????".substring(0,"????????".offsetByCodePoints(0,1) // "????"
"????????".substring(2,"????????".offsetByCodePoints(1,2)) // "????"
5. Iterating Unicode string with BreakIterator
6. Sorting...
Safari 3rd party cookie iframe trick no longer working?
...ession and redirect it back to facebook.
Add this code in the top of your index.php and set $page_url to your application final tab/app URL and you’ll see your application will work without any problem.
<?php
// START SAFARI SESSION FIX
session_start();
$page_url = "http://www.fac...
Why shouldn't I use mysql_* functions in PHP?
...statement
Now I come to fetch mode:
PDO::FETCH_ASSOC: returns an array indexed by column name as returned in your result set
PDO::FETCH_BOTH (default): returns an array indexed by both column name and 0-indexed column number as returned in your result set
There are even more choices! Read abou...