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How to split a column into two columns?
...ferent lengths:
>>> df = pd.DataFrame({'AB': ['A1-B1', 'A2-B2', 'A3-B3-C3']})
>>> df
AB
0 A1-B1
1 A2-B2
2 A3-B3-C3
>>> df['A'], df['B'], df['C'] = df['AB'].str.split('-')
Traceback (most recent call last):
[...]
ValueError: Length of values does no...
Assign one struct to another in C
...,%ebp
401053: a1 20 20 40 00 mov 0x402020,%eax
401058: a3 30 20 40 00 mov %eax,0x402030
40105d: a1 24 20 40 00 mov 0x402024,%eax
401062: a3 34 20 40 00 mov %eax,0x402034
401067: a1 28 20 40 00 mov 0x402028,%eax
40106c:...
Easiest way to compare arrays in C#
...int[] { 1, 2, 3 };
int[] a2 = new int[] { 3, 2, 1 };
int[] a3 = new int[] { 1, 3 };
int[] a4 = null;
int[] a5 = null;
int[] a6 = new int[0];
Console.WriteLine(a1.ItemsEqual(a2)); // Output: True.
Console.WriteLine(a2.ItemsEqual(a3)); // Output...
Linq to Entities join vs groupjoin
... two lists:
Id Value
1 A
2 B
3 C
Id ChildValue
1 a1
1 a2
1 a3
2 b1
2 b2
When you Join the two lists on the Id field the result will be:
Value ChildValue
A a1
A a2
A a3
B b1
B b2
When you GroupJoin the two lists on the Id field the result will be:
Value Chil...
What is Unicode, UTF-8, UTF-16?
...te way, when storing to hardware.
30 42 (hex) - > UTF8 encoding - > E3 81 82 (hex), which is above result in binary.
30 42 (hex) - > UTF16 encoding - > 30 42 (hex), which is above result in binary.
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Build error: You must add a reference to System.Runtime
...tem.Runtime, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a" />
</assemblies>
The final web.config tags should look like this:
<compilation debug="true" targetFramework="4.5">
<assemblies>
<add assembly="System.Runtime, Version=4.0.0.0, C...
Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
...
82
I bet entering all number in a hash set and iterating over the 1...N suite using lookups to determine if numbers are missing, would be the ...
Controlling number of decimal digits in print output in R
...the magnitude of the numbers themselves they are large.
As mentioned by e3bo, you can use multiple-precision floating point numbers using the Rmpfr package.
mpfr("3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825")
These are slower and more memory int...
Reordering of commits
...ve is the command you want.
Example:
The current status is this:
bernt@le3180:~/src/stackoverflow/reordering_of_commits
$ git status
On branch master
nothing to commit, working tree clean
bernt@le3180:~/src/stackoverflow/reordering_of_commits
$ git log --oneline
a6e3c6a (HEAD -> master) Fourth...
Why not use HTTPS for everything?
...r logging in then you are in clear violation of The OWASP top 10 for 2010 "A3: Broken Authentication and Session Management".
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