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how does multiplication differ for NumPy Matrix vs Array classes?
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127
The main reason to avoid using the matrix class is that a) it's inherently 2-dimensional, and ...
dropping infinite values from dataframes in pandas?
... use the dropna:
df.replace([np.inf, -np.inf], np.nan).dropna(subset=["col1", "col2"], how="all")
For example:
In [11]: df = pd.DataFrame([1, 2, np.inf, -np.inf])
In [12]: df.replace([np.inf, -np.inf], np.nan)
Out[12]:
0
0 1
1 2
2 NaN
3 NaN
The same method would work for a Series.
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Pinging servers in Python
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117
This function works in any OS (Unix, Linux, macOS, and Windows)
Python 2 and Python 3
EDITS:
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Is there a standard sign function (signum, sgn) in C/C++?
I want a function that returns -1 for negative numbers and +1 for positive numbers.
http://en.wikipedia.org/wiki/Sign_function
It's easy enough to write my own, but it seems like something that ought to be in a standard library somewhere.
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jquery ui Dialog: cannot call methods on dialog prior to initialization
I have an app on jquery 1.5 with dialogs worked fine.
While I have a lot of .live handlers, I changed this to .on.
For that, I have to update jquery (now 1.8.3 an jquerui 1.9.1).
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How do you reindex an array in PHP?
...hich I would like to reindex so the keys are reversed (ideally starting at 1):
21 Answers
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Return multiple values in JavaScript?
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1380
No, but you could return an array containing your values:
function getValues() {
return ...
How to go about formatting 1200 to 1.2k in java
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162
+100
Here i...
What does 'COLLATE SQL_Latin1_General_CP1_CI_AS' do?
...e database server sorts (compares pieces of text). in this case:
SQL_Latin1_General_CP1_CI_AS
breaks up into interesting parts:
latin1 makes the server treat strings using charset latin 1, basically ascii
CP1 stands for Code Page 1252
CI case insensitive comparisons so 'ABC' would equal 'abc'
A...