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Large, persistent DataFrame in pandas
...(here's a tedious one: you could transcribe the file row-by-row into a pre-allocated NumPy array or memory-mapped file--np.mmap), but it's one I'll be working on in the near future. Another solution is to read the file in smaller pieces (use iterator=True, chunksize=1000) then concatenate then with ...
How to display nodejs raw Buffer data as Hex string
... is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead. So now it should be Buffer.from( buf.toString('hex'),'hex');
– flob
Mar 12 '19 at 12:47
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Move assignment operator and `if (this != &rhs)`
...ll you need to do is a memcpy (hidden under std::copy). You don't want to allocate a new array of the same size and then deallocate the old one of the same size!
Now for your clients who actually want strong exception safety:
template <class C>
C&
strong_assign(C& lhs, C rhs)
{
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When should I create a destructor?
...en would the fourth field initializer run? Never. But the object is still allocated and must be finalized. Heck, you don't even have a guarantee that fields of type double were fully initialized when the dtor runs. There could have been a thread abort halfway through writing the double and now the ...
What is the difference between Scope_Identity(), Identity(), @@Identity, and Ident_Current()?
... of the inserted record from the trigger.
IdentCurrent: The last identity allocated for the table.
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MySQL InnoDB not releasing disk space after deleting data rows from table
... 2M data rows. When I deleted data rows from the table, it did not release allocated disk space. Nor did the size of the ibdata1 file reduce after running the optimize table command.
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What's the difference between unit tests and integration tests? [duplicate]
... They usually require resources like database instances and hardware to be allocated for them. The integration tests do a more convincing job of demonstrating the system works (especially to non-programmers) than a set of unit tests can, at least to the extent the integration test environment resemb...
Java Desktop application: SWT vs. Swing [closed]
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@JanTobola It's plain wrong. Native components use memory allocated on the native heap, not only on the Java heap. I've worked on large GUIs using Netbeans Platform, Eclipse RCP, SWT and Swing.There were some serious concerns of memory footprint in Swing in very early versions of Ja...
How to convert image to byte array
...eeling it might have had something to do with a 4K byte boundary in memory allocation. But that could easily be wrong. I switched to using a MemoryStream with a BinaryFormatter and I was able to become very consistent as tested with over 250 different test images of varying formats and sizes, loop...
Java String - See if a string contains only numbers and not letters
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If you look at the code of toCharArray, it is allocating a char array and copying the chars (i think that could be expensive). What about if you just iterate the string using an index and charAt, would it be faster? Would be interesting also if you could add the soluti...