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Difference between private, public, and protected inheritance
...of having the base class as a private base, make in a member of derived in order to reuse base class's functionality.
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Java: difference between strong/soft/weak/phantom reference
...ion or map, and we need to do a lot of processing on them regularly, So in order keep performance we will keep them in the cache.
As far as this is good but now we need different data and we don’t need those Employee objects and these are not referenced from anywhere except the cache. Which is cau...
How do I remove a project configuration in Visual Studio 2008?
...ad carefully (especially the part for each project). Maybe the word choice/order in my answer is not properly optimized for best comprehensibility, but that does not change whether this works or not.
– Timbo
Oct 11 '14 at 18:07
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Efficiently updating database using SQLAlchemy ORM
...t at times doing a large query and then iterating in python can be up to 2 orders of magnitude faster than lots of queries. I assume that iterating over the query object is less efficient than iterating over a list generated by the all() method of the query object.
[Please note comment below - thi...
Is there a library function for Root mean square error (RMSE) in python?
...a best guess could be preferred if there are lots of missing values.
In order to guarantee relative correctness of the RMSE output, you must eliminate all nulls/infinites from the input.
RMSE has zero tolerance for outlier data points which don't belong
Root mean squared error squares relies on...
Save PL/pgSQL output from PostgreSQL to a CSV file
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and \o in order to print console again
– metdos
Aug 6 '12 at 14:57
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Which Eclipse files belong under version control?
...h Configuration preference panel: It is common to soft-delete a project in order to import it back again - to force a reinitialization of the eclipse metadata. But this option, if checked, will remove your detailed launch parameters!)
project-dir/.project
project-dir/.classpath
project-dir/.setting...
scp (secure copy) to ec2 instance without password
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I figured it out. I had the arguments in the wrong order. This works:
scp -i mykey.pem somefile.txt root@my.ec2.id.amazonaws.com:/
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Why does += behave unexpectedly on lists?
... operands and makes a new list containing those elements maintaining their order.
+= operator calls __iadd__ method on the list. It takes an iterable and appends all the elements of the iterable to the list in place. It does not create a new list object.
In class foo the statement self.bar +=...
Working with select using AngularJS's ng-options
...t; element. In that case you can perform certain string concatenations, in order to have more complex option labels.
Examples:
ng-options="item.ID as item.Title + ' - ' + item.ID for item in items" gives you labels like Title - ID
ng-options="item.ID as item.Title + ' (' + item.Title.length + ')'...