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Conditions for automatic generation of default/copy/move ctor and copy/move assignment operator?
I want to refresh my memory on the conditions under which a compiler typically auto generates a default constructor, copy constructor and assignment operator.
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Reshaping data.frame from wide to long format
...s melt/cast. Here is a solution with reshape, assuming your data frame is called d:
reshape(d,
direction = "long",
varying = list(names(d)[3:7]),
v.names = "Value",
idvar = c("Code", "Country"),
timevar = "Year",
times = 1950:1954)
...
How do I run a terminal inside of Vim?
...l+Z, for example, you can move to another folder, then ls then git status, etc. Ctrl+Z is a "pause", you can "resume" with fg. But with :!bash, as I know so far, you only can run a single command at once, or even if you can run more than a command at once, it's still not convenient. So overall, 'Ctr...
What is the best way to compare floats for almost-equality in Python?
...t's worth noting that the documentation also says: "Modulo error checking, etc, the function will return the result of..." In other words, the isclose function (above) is not a complete implementation.
– rkersh
Jul 14 '16 at 19:50
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Pandoc markdown page break
...tput if the target format can contain raw TeX (i.e., LaTeX, Markdown, Org, etc.).
We can use a simple Lua filter to translate this when targeting a different format. The following works for docx, LaTeX, epub, and light-weight markup.
--- Return a block element causing a page break in the given for...
How are software license keys generated?
...S to both verify your key and obtain the product-type (Home, Professional, etc.) at the same time. Additionally, it requires online activation.
The full algorithm is rather complex, but outlined nicely in this (completely legal!) paper, published in Germany.
Of course, no matter what you do, unles...
Getting the name of the currently executing method
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Thread.currentThread().getStackTrace() will usually contain the method you’re calling it from but there are pitfalls (see Javadoc):
Some virtual machines may, under some circumstances, omit one or more stack frames from the stack trace. In the extreme case, a virtua...
Inspect attached event handlers for any DOM element
...k= handler or HTML <element onclick="handler"> can be retrieved trivially from the element.onclick property from script or in-debugger.
Event handlers attached using DOM Level 2 Events addEventListener methods and IE's attachEvent cannot currently be retrieved from script at all. DOM Level 3 ...
How to grep (search) committed code in the Git history
...s and the like), you need to do:
git grep <regexp> $(git rev-list --all)
git rev-list --all | xargs git grep <expression> will work if you run into an "Argument list too long" error.
If you want to limit the search to some subtree (for instance, "lib/util"), you will need to pass tha...
What can MATLAB do that R cannot do? [closed]
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filter design,
fuzzy logic/fuzzy control,
partial differential equations,
etc.
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edited Nov 17 '09 at 9:34
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