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Why are two different concepts both called “heap”?
...you to store the data you were trying to store Update: What I said sounds exactly like buddy blocks en.wikipedia.org/wiki/Dynamic_memory_allocation#Buddy%5Fblocks
– Will
Jan 16 '13 at 22:37
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When using Spring Security, what is the proper way to obtain current username (i.e. SecurityContext)
...he suggestions of the author and simplified the injection of 'SecurityContextHolder'. More details are in the comments.
This is the solution I've ended up going with. Instead of using SecurityContextHolder in my controller, I want to inject something which uses SecurityContextHolder under the ho...
What is an OS kernel ? How does it differ from an operating system? [closed]
...player". A kernel doesn't match that definition.
So for an end-user a Linux distribution (say Ubuntu) is an Operating System while for a programmer the Linux kernel itself is a perfectly valid OS depending on what you're trying to achieve. For instance embedded systems are mostly just kernel with v...
Difference between \n and \r?
...they're 10 and 13 respectively;-).
But seriously, there are many:
in Unix and all Unix-like systems, \n is the code for end-of-line, \r means nothing special
as a consequence, in C and most languages that somehow copy it (even remotely), \n is the standard escape sequence for end of line (transla...
PHP Pass variable to next page
...aw on the previous page, is completely unconnected with the current page. Except if you use something like sessions, cookies or GET / POST variables. Sessions and cookies are quite easy to use, with session being by far more secure than cookies. More secure, but not completely secure.
Session:
//O...
pandas three-way joining multiple dataframes on columns
...df1, df2, dfN]
Assuming they have some common column, like name in your example, I'd do the following:
df_final = reduce(lambda left,right: pd.merge(left,right,on='name'), dfs)
That way, your code should work with whatever number of dataframes you want to merge.
Edit August 1, 2016: For those ...
Swift compiler error: “non-modular header inside framework module”
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Is your header public?
Select the header file in the project explorer. Then in the section on the right in xcode, you'll notice there is a dropdown next to the target. Change that from "project" to "public". This worked for me.
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Install NPM into home directory with distribution nodejs package (Ubuntu)
...t NPM to use this directory for its global package installs:
$ echo "prefix = $NPM_PACKAGES" >> ~/.npmrc
Configure your PATH and MANPATH to see commands in your $NPM_PACKAGES prefix by adding the following to your .zshrc/.bashrc:
# NPM packages in homedir
NPM_PACKAGES="$HOME/.npm-packages"
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How does free know how much to free?
... technique in my own functions to save me from needing to cart around the extra variable of the array's length?
11 Answers
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Elegant way to check for missing packages and install them?
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I think the proper syntax is: if(length(new.packages)>0) {install.packages(new.packages)}
– user3904098
Aug 14 '15 at 10:16
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