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C# How can I check if a URL exists/is valid?
... looks up a stock symbol on Yahoo! Finance, downloads the historical data, and then plots the price history for the specified ticker symbol.
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Persistent invalid graphics state error when using ggplot2
I believe my dataframe is okay and my code is okay. In fact, I have eliminated parts of the dataframe and most of the graphing code to make things as basic as possible. But still, I get:
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In Perl, how can I read an entire file into a string?
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Add:
local $/;
before reading from the file handle. See How can I read in an entire file all at once?, or
$ perldoc -q "entire file"
See Variables related to filehandles in perldoc perlvar and perldoc -f local.
Incidentally, if you can put your script on the server,...
How can I create an Asynchronous function in Javascript?
...iscussing this with a friend yesterday so this answer is perfect! I understand and can identify the async functions and use them in JS properly. But simply why can't we implement custom ones is not clear to me. It's like a black box that we know how make it work (using, say, setInterval) but that we...
update package.json version automatically
Before I do a small release and tag it, I'd like to update the package.json to reflect the new version of the program.
11 A...
Get type of a generic parameter in Java with reflection
... to be some reflection-magic around that I unfortunetly don't fully understand... Sorry.
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How do I find the location of my Python site-packages directory?
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There are two types of site-packages directories, global and per user.
Global site-packages ("dist-packages") directories are listed in sys.path when you run:
python -m site
For a more concise list run getsitepackages from the site module in Python code:
python -c 'import sit...
Is there an opposite to display:none?
...whether an element is visible or not. It therefore has two states (visible and hidden), which are opposite to each other.
The display property, however, decides what layout rules an element will follow. There are several different kinds of rules for how elements will lay themselves out in CSS, so t...
Set opacity of background image without affecting child elements
... your image into an image editor, turn down the opacity, save it as a .png and use that instead.
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Purpose of asterisk before a CSS property
...immediately before a
property name, the property will be
applied in IE and not in other
browsers. Unlike with the hyphen and
underscore method, the CSS
specification makes no reservations
for the asterisk as a prefix, so use
of this hack could result in
unexpected behavior as the CSS...