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What's invokedynamic and how do I use it?
...creator, though, you can use it to build more flexible, more efficient JVM-based languages. Here is a really sweet blog post that gives a lot of detail.
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Best way to add Activity to an Android project in Eclipse?
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I just use the "New Class" dialog in Eclipse and set the base class as Activity. I'm not aware of any other way to do this. What other method would you expect to be available?
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Purpose of ESI & EDI registers?
...) others:
AX = accumulator
DX = double word accumulator
CX = counter
BX = base register
They look like general purpose registers, but there are a number of instructions which (unexpectedly?) use one of them—but which one?—implicitly.
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MySQL: Fastest way to count number of rows
...ow count, it doensn't count all rows each time you try to count all rows. (based on primary key's column)
Using PHP to count rows is not very smart, because you have to send data from mysql to php. Why do it when you can achieve the same on the mysql side?
If the COUNT(*) is slow, you should run E...
Modifying a subset of rows in a pandas dataframe
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Use .loc for label based indexing:
df.loc[df.A==0, 'B'] = np.nan
The df.A==0 expression creates a boolean series that indexes the rows, 'B' selects the column. You can also use this to transform a subset of a column, e.g.:
df.loc[df.A==0, '...
Changing font size and direction of axes text in ggplot2
... to previous solutions, you can also specify the font size relative to the base_size included in themes such as theme_bw() (where base_size is 11) using the rel() function.
For example:
ggplot(mtcars, aes(disp, mpg)) +
geom_point() +
theme_bw() +
theme(axis.text.x=element_text(size=rel(0.5),...
Is there a CSS selector for elements containing certain text?
...doesn't need to know about its client is going to consider as important to base styling on. Right now our html content typically is tightly paired to the css by including classes that we know the styler cares about. They are already shifting towards letting CSS at the content, as evidenced by attr...
How does Spring autowire by name when more than one matching bean is found?
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You can use the @Qualifier annotation
From here
Fine-tuning annotation-based autowiring with qualifiers
Since autowiring by type may lead to multiple candidates, it is often necessary to have more control over the selection process. One way to accomplish this is with Spring's @Qualifier annotat...
What are Aggregates and PODs and how/why are they special?
... (12.1), no private or protected non-static data members (clause 11),
no base classes (clause 10), and no virtual functions (10.3).
So, OK, let's parse this definition. First of all, any array is an aggregate. A class can also be an aggregate if… wait! nothing is said about structs or unions, ...
Why does HTML5 form-validation allow emails without a dot?
...that it is of minimum use. Nevertheless, the web browsers are to implement based on standards (i.e. RFCs), not based on the most common cases.
– Ali Alavi
Dec 17 '13 at 16:26
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