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Pandas dataframe get first row of each group
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248
>>> df.groupby('id').first()
value
id
1 first
2 first
3 first
4 ...
Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
...-std=c++0x -O3 -save-temps -march=native
Ubuntu 12
Different Registers: 18.6195 GB/s
.L4:
movq (%rbx,%rax,8), %r8
movq 8(%rbx,%rax,8), %r9
movq 16(%rbx,%rax,8), %r10
movq 24(%rbx,%rax,8), %r11
addq $4, %rax
popcnt %r8, %r8
add %r8, %rdx
popcnt %r...
What is the Invariant Culture?
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answered Mar 11 '10 at 8:05
Andrew BezzubAndrew Bezzub
14.5k66 gold badges4444 silver badges6767 bronze badges
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Creating a new dictionary in Python
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687
Call dict with no parameters
new_dict = dict()
or simply write
new_dict = {}
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Convert NSData to String?
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NSString *myString = [[NSString alloc] initWithData:myData encoding:NSUTF8StringEncoding];
Remark: Please notice the NSData value must be valid for the encoding specified (UTF-8 in the example above), otherwise nil will be returned:
Returns nil if the initialization fails for some reason (for ex...
How can I add items to an empty set in python
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edited Jul 7 '13 at 10:28
answered Jul 7 '13 at 10:23
Ash...
Why does base64 encoding require padding if the input length is not divisible by 3?
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edited Aug 28 '15 at 11:19
answered Oct 29 '14 at 13:55
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Iterate a list with indexes in Python
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edited Jun 18 '12 at 16:30
dbr
148k6161 gold badges260260 silver badges328328 bronze badges
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How can I install an older version of a package via NuGet?
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580
Try the following:
Uninstall-Package Newtonsoft.Json -Force
Followed by:
Install-Package Newto...
RGB to hex and hex to RGB
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1289
Note: both version of rgbToHex expect integer values for r, g and b, so you'll need to do your...