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numpy: most efficient frequency counts for unique values in an array
...ncount(x)
ii = np.nonzero(y)[0]
And then:
zip(ii,y[ii])
# [(1, 5), (2, 3), (5, 1), (25, 1)]
or:
np.vstack((ii,y[ii])).T
# array([[ 1, 5],
[ 2, 3],
[ 5, 1],
[25, 1]])
or however you want to combine the counts and the unique values.
...
How do I save a String to a text file using Java?
...
737
If you're simply outputting text, rather than any binary data, the following will work:
PrintW...
insert vs emplace vs operator[] in c++ map
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236
In the particular case of a map the old options were only two: operator[] and insert (different...
How do I find the PublicKeyToken for a particular dll?
...
293
Using PowerShell, you can execute this statement:
([system.reflection.assembly]::loadfile("c:\M...
Optimal way to concatenate/aggregate strings
....SourceTable (ID, Name)
VALUES
(1, 'Matt'),
(1, 'Rocks'),
(2, 'Stylus'),
(3, 'Foo'),
(3, 'Bar'),
(3, 'Baz')
The query result:
ID FullName
----------- ------------------------------
2 Stylus
3 Bar, Baz, Foo
1 Matt, Rocks
...
std::vector versus std::array in C++
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326
std::vector is a template class that encapsulate a dynamic array1, stored in the heap, that gr...
Serializing a list to JSON
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345
If using .Net Core 3.0 or later;
Default to using the built in System.Text.Json parser implem...
Get current time in seconds since the Epoch on Linux, Bash
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SteefSteef
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Can a class member function template be virtual?
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334
Templates are all about the compiler generating code at compile-time. Virtual functions are al...
Unable to cast object of type 'System.DBNull' to type 'System.String`
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Soner Gönül
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answered May 15 '09 at 20:25
UserUser
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