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An algorithm for inflating/deflating (offsetting, buffering) polygons
... For anyone that wants to do this, another alternative is to use GEOS, and if your using python, GEOS's wrapper, Shapely. A really pretty example: toblerity.github.com/shapely/manual.html#object.buffer
– pelson
Oct 3 '12 at 8:04
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Create a folder if it doesn't already exist
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Try this, using mkdir:
if (!file_exists('path/to/directory')) {
mkdir('path/to/directory', 0777, true);
}
Note that 0777 is already the default mode for directories and may still be modified by the current umask.
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In C, do braces act as a stack frame?
If I create a variable within a new set of curly braces, is that variable popped off the stack on the closing brace, or does it hang out until the end of the function? For example:
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How do you test to see if a double is equal to NaN?
I have a double in Java and I want to check if it is NaN .
What is the best way to do this?
7 Answers
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How can I stop a Postgres script when it encounters an error?
Is there a way to specify that when executing a sql script it stops when encountering the first error on the script, it usually continues, regardless of previous errors.
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How can I check if character in a string is a letter? (Python)
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str.isalpha()
Return true if all characters in the string are alphabetic and there is at least one character, false otherwise. Alphabetic characters are those characters defined in the Unicode character database as “Letter”, i.e., those with gener...
How to keep Maven profiles which are activeByDefault active even if another profile gets activated?
...ally when the flag is not there. The profile firstProfile is disabled only if you specify -DskipFirstProfile (eg mvn verify -DskipFirstProfile).
– seanf
Jun 28 '17 at 4:08
add...
Java: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification
...it, it returns a lot of errors. It seems that I have a problem with my certificate. Is it possible to ignore the client-server authentication? If so, how?
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Keyboard Interrupts with python's multiprocessing Pool
...lmost certainly interrupt a condition wait.
Note that this doesn't happen if a timeout is specified; cond.wait(1) will receive the interrupt immediately. So, a workaround is to specify a timeout. To do that, replace
results = pool.map(slowly_square, range(40))
with
results = pool.map_...
How do I concatenate or merge arrays in Swift?
If there are two arrays created in swift like this:
12 Answers
12
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