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Change column type from string to float in Pandas
...ring and numeric values
>>> s
0 8
1 6
2 7.5
3 3
4 0.9
dtype: object
>>> pd.to_numeric(s) # convert everything to float values
0 8.0
1 6.0
2 7.5
3 3.0
4 0.9
dtype: float64
As you can see, a new Series is returned. Remember to assign this output ...
count the frequency that a value occurs in a dataframe column
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446
Use groupby and count:
In [37]:
df = pd.DataFrame({'a':list('abssbab')})
df.groupby('a').coun...
Using socket.io in Express 4 and express-generator's /bin/www
... deal: I'm trying to use socket.io in an express project. After Express Js 4 was lauched, i've updated my express-generator and now the app initial functions goes into ./bin/www file, including those vars (www file contents: http://jsfiddle.net/avMa5/ )
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Common elements comparison between 2 lists
...
>>> list1 = [1,2,3,4,5,6]
>>> list2 = [3, 5, 7, 9]
>>> list(set(list1).intersection(list2))
[3, 5]
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Is an entity body allowed for an HTTP DELETE request?
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594
The spec does not explicitly forbid or discourage it, so I would tend to say it is allowed.
Mic...
Remove an entire column from a data.frame in R
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421
You can set it to NULL.
> Data$genome <- NULL
> head(Data)
chr region
1 chr1 C...
Arrays, heap and stack and value types
...s of memory (assuming a 32-bit word size). The field I in each case takes 4 bytes to store its value, the field S takes 4 bytes to store its reference, and the field L takes 8 bytes to store its value. So the memory for the value of both RefType and ValType looks like this:
0 ┌─────...
Application Crashes With “Internal Error In The .NET Runtime”
We have an application written against .NET 4.0 which over the weekend crashed, putting the following message into the event log:
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NSUserDefaults not cleared after app uninstall on simulator
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answered Aug 1 '14 at 18:52
andersanders
3,87522 gold badges2020 silver badges3131 bronze badges
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How to select multiple rows filled with constants?
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SELECT 1, 2, 3
UNION ALL SELECT 4, 5, 6
UNION ALL SELECT 7, 8, 9
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