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Why doesn't Python have a sign function?
...+/-nan, etc)
So they decided to implement only copysign, which (although more verbose) can be used to delegate to the end user the desired behavior for edge cases - which sometimes might require the call to cmp(x,0).
I don't know why it's not a built-in, but I have some thoughts.
copysign(x,y):...
Should I declare Jackson's ObjectMapper as a static field?
...per.
They are fully immutable, thread-safe, meaning that it is not even theoretically possible to cause thread-safety issues (which can occur with ObjectMapper if code tries to re-configure instance).
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Remove Last Comma from a string
... can I remove the last comma, but only if the comma is the last character or if there is only white space after the comma? This is my code.
I got a working fiddle . But it has a bug.
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How can I sharpen an image in OpenCV?
...use a Gaussian smoothing filter and subtract the smoothed version from the original image (in a weighted way so the values of a constant area remain constant).
To get a sharpened version of frame into image: (both cv::Mat)
cv::GaussianBlur(frame, image, cv::Size(0, 0), 3);
cv::addWeighted(frame, 1.5...
How to access maven.build.timestamp for resource filtering
... and would like to make the build timestamp accessible to my application. For this, I'm putting a placeholder in a .properties file and let maven filter on build. While this is working fine for ${project.version} , ${maven.build.timestamp} is not substituted on filtering.
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Compiler error: memset was not declared in this scope
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You should include <string.h> (or its C++ equivalent, <cstring>).
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How are “mvn clean package” and “mvn clean install” different?
...kage and install?
package will compile your code and also package it. For example, if your pom says the project is a jar, it will create a jar for you when you package it and put it somewhere in the target directory (by default).
install will compile and package, but it will also put the packag...
Git, How to reset origin/master to a commit?
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origin/xxx branches are always pointer to a remote. You cannot check them out as they're not pointer to your local repository (you only checkout the commit. That's why you won't see the name written in the command line interf...
HTML Body says cz-shortcut-listen=“true” with Chrome's Developer Tools?
...rsion 22.0.1229.94 m, I saw the <body> tag has the attribute cz-shortcut-listen="true" (which of course is not on my code). What does it mean and why is it showing up? (I tried looking it up in google, but found nothing relevant)
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Is it safe to push_back an element from the same vector?
..._back causes a reallocation, the reference to the first integer in the vector will no longer be valid. So this isn't safe?
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