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Replace a value in a data frame based on a conditional (`if`) statement
In the R data frame coded for below, I would like to replace all of the times that B
appears with b .
8 Answers
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Check if a program exists from a Makefile
How can I check if a program is callable from a Makefile?
12 Answers
12
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In which scenario do I use a particular STL container?
I've been reading up on STL containers in my book on C++, specifically the section on the STL and its containers. Now I do understand each and every one of them have their own specific properties, and I'm close to memorizing all of them... But what I do not yet grasp is in which scenario each of the...
Docker - how can I copy a file from an image to a host?
My question is related to this question on copying files from containers to hosts; I have a Dockerfile that fetches dependencies, compiles a build artifact from source, and runs an executable. I also want to copy the build artifact (in my case it's a .zip produced by sbt dist in '../target/`, ...
How can I pass a list as a command-line argument with argparse?
I am trying to pass a list as an argument to a command line program. Is there an argparse option to pass a list as option?
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Why do C++ libraries and frameworks never use smart pointers?
I read in a few articles that raw pointers should almost never be used. Instead they should always be wrapped inside smart pointers, whether it's scoped or shared pointers.
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Why does Java allow us to compile a class with a name different than the file name?
I have a file Test.java and the following code inside it.
8 Answers
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How do you fix a bad merge, and replay your good commits onto a fixed merge?
I accidentally committed an unwanted file ( filename.orig while resolving a merge) to my repository several commits ago, without me noticing it until now. I want to completely delete the file from the repository history.
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What is the best way to implement “remember me” for a website? [closed]
I want my website to have a checkbox that users can click so that they will not have to log in each time they visit my website. I know I will need to store a cookie on their computer to implement this, but what should be contained in that cookie?
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Do htmlspecialchars and mysql_real_escape_string keep my PHP code safe from injection?
Earlier today a question was asked regarding input validation strategies in web apps .
6 Answers
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