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Why is list initialization (using curly braces) better than the alternatives?
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Basically copying and pasting from Bjarne Stroustrup's "The C++ Programming Language 4th Edition":
List initialization does not allow narrowing (§iso.8.5.4). That is:
An integer cannot be converted to another integer that cann...
Connect Java to a MySQL database
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Here's a step by step explanation how to install MySQL and JDBC and how to use it:
Download and install the MySQL server. Just do it the usual way. Remember the port number whenever you've changed it. It's by default 3306.
Download the JDBC driver and put in classpath...
pandas resample documentation
...ffsets), and a section about resampling.
Note that there isn't a list of all the different how options, because it can be any NumPy array function and any function that is available via groupby dispatching can be passed to how by name.
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Problems with lib-icu dependency when installing Symfony 2.3.x via Composer
I've had no problems installing Symfony 2.2.x using Composer, I've always just copied the stable version at http://symfony.com/download .
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The object cannot be deleted because it was not found in the ObjectStateManager
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It means that entity is not attached (it was not loaded by the same context instance). Try this:
protected MyEntities sqlEntities;
public virtual void Delete(TEntity entity)
{
sqlEntities.Attach(entity);
sqlEntities.DeleteObject(entity);
sqlEntities.SaveChanges();
}
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Set the absolute position of a view
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You can use RelativeLayout. Let's say you wanted a 30x40 ImageView at position (50,60) inside your layout. Somewhere in your activity:
// Some existing RelativeLayout from your layout xml
RelativeLayout rl = (RelativeLayout) findViewById(R.id.my_relative_layout);
ImageView iv...
Count number of lines in a git repository
How would I count the total number of lines present in all the files in a git repository?
15 Answers
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(How) can I count the items in an enum?
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There's not really a good way to do this, usually you see an extra item in the enum, i.e.
enum foobar {foo, bar, baz, quz, FOOBAR_NR_ITEMS};
So then you can do:
int fuz[FOOBAR_NR_ITEMS];
Still not very nice though.
But of course you...
Subtract 7 days from current date
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Actually this can be done simply by: [now dateByAddingDays:-7]
– CrashOverride
Mar 5 '15 at 23:45
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pull out p-values and r-squared from a linear regression
...mmary object summary(fit)$r.squared. See names(summary(fit)) for a list of all the items you can extract directly.
Model p-value: If you want to obtain the p-value of the overall regression model,
this blog post outlines a function to return the p-value:
lmp <- function (modelobject) {
if ...