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How to avoid overflow in expr. A * B - C * D
...c * d
x / (a * d) = (a * b - c * d) / (a * d)
x / (a * d) = b / d - c / a
now, the integer/mod stuff:
x / (a * d) = (b / d + ( b % d ) / d) - (c / a + ( c % a ) / a )
x / (a * d) = (b / d - c / a) - ( ( c % a ) / a - ( b % d ) / d)
x = (b / d - c / a) * a * d - ( ( c % a ) * d - ( b % d ) * a)
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How to make Eclipse behave well in the Windows 7 taskbar?
...ipse. Still not working! 8. Unpin from taskbar and pin again. (???) 9. And NOW it works...
– MarioVilas
Jul 14 '12 at 16:37
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Bash variable scope
...piping into the while loop, a sub-shell is created to run the while loop.
Now this child process has its own copy of the environment and can't pass any
variables back to its parent (as in any unix process).
Therefore you'll need to restructure so that you're not piping into the loop.
Alternatively...
SQL select only rows with max value on a column [duplicate]
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I know that MySQL allows you to add non aggregate fields to a "grouped by" query, but I find that kinda pointless. Try running this select id, max(rev), rev from YourTable group by id and you see what I mean. Take your time and ...
Command prompt won't change directory to another drive
...e
if you want to go to your D:\ drive then type this command
cd /d D:\
now your current working directory is D:\ drive so you want go to Java directory under Docs so type below command :
cd Docs\Java
note : d stands for drive
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Simple argparse example wanted: 1 argument, 3 results
... excellent I'm sure, is too much for my tiny beginner brain to grasp right now. I don't need to do math on the command line or meddle with formatting lines on the screen or change option characters. All I want to do is "If arg is A, do this, if B do that, if none of the above show help and quit" .
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What is an application binary interface (ABI)?
... Libraries are full of code and other resources, but your program has to know how to locate what it needs inside the library file. Your ABI defines how the contents of a library are stored inside the file, and your program uses the ABI to search through the file and find what it needs. If everyth...
Adding new column to existing DataFrame in Python pandas
... did it wrong (it can trigger false positives) but from 0.13.0 it let you know there are more adequate methods for the same purpose. Then, if you get the warning, just follow its advise: Try using .loc[row_index,col_indexer] = value instead
>>> df1.loc[:,'f'] = pd.Series(np.random.randn(sL...
Closing JDBC Connections in Pool
...o, isn't the purpose of pooling lost? And if not, how does the DataSource know when a particular instance of Connection is freed up and can be reused? I am a little confused on this one, any pointers appreciated.
Yes, certainly you need to close the pooled connection as well. It's actually a wrappe...
How to undo 'git reset'?
...ned by checking out a particular commit (though that's not important right now). So, to undo the reset, run git reset HEAD@{1} (or git reset d27924e).
If, on the other hand, you've run some other commands since then that update HEAD, the commit you want won't be at the top of the list, and you'll n...