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How to sort a dataFrame in python pandas by two or more columns?
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3 Answers
3
Active
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Best way to make Java's modulus behave like it should with negative numbers?
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edited Sep 13 '14 at 10:44
Maarten Bodewes
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Determine function name from within that function (without using traceback)
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David Foerster
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answered Feb 21 '11 at 15:16
Rosh OxymoronRosh O...
Identifying the dependency relationship for python packages installed with pip
...e [installed: 0.18]
- itsdangerous [required: >=0.21, installed: 0.23]
alembic==0.6.2
- SQLAlchemy [required: >=0.7.3, installed: 0.9.1]
- Mako [installed: 0.9.1]
- MarkupSafe [required: >=0.9.2, installed: 0.18]
ipython==2.0.0
slugify==0.0.1
redis==2.9.1
To get it run:
pip i...
How to use jQuery in chrome extension?
...e this :
"background":
{
"scripts": ["thirdParty/jquery-2.0.3.js", "background.js"]
}
If you need jquery in a content_scripts, you have to add it in the manifest too:
"content_scripts":
[
{
"matches":["http://website*"],
"js":["thirdParty/jq...
Kill a Process by Looking up the Port being used by it from a .BAT
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edited Dec 1 '11 at 3:01
answered Jun 1 '11 at 16:13
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Average of 3 long integers
I have 3 very large signed integers.
12 Answers
12
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Pandas: create two new columns in a dataframe with values calculated from a pre-existing column
... from pandas import *
In [2]: def calculate(x):
...: return x*2, x*3
...:
In [3]: df = DataFrame({'a': [1,2,3], 'b': [2,3,4]})
In [4]: df
Out[4]:
a b
0 1 2
1 2 3
2 3 4
In [5]: df["A1"], df["A2"] = zip(*df["a"].map(calculate))
In [6]: df
Out[6]:
a b A1 A2
0 1 2 2...
Is R's apply family more than syntactic sugar?
... makeSOCKcluster(c("localhost","localhost"))
parSapply(cl, 1:20, get("+"), 3)
This example uses a socket cluster, for which no additional software needs to be installed; otherwise you will need something like PVM or MPI (see Tierney's clustering page). snow has the following apply functions:
par...
How can I loop through a List and grab each item?
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answered Sep 18 '13 at 3:08
Simon WhiteheadSimon Whitehead
54.9k66 gold badges8383 silver badges119119 bronze badges
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