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How do you delete a column by name in data.table?
...the following will remove column foo from the data.table df3:
# Method 1 (and preferred as it takes 0.00s even on a 20GB data.table)
df3[,foo:=NULL]
df3[, c("foo","bar"):=NULL] # remove two columns
myVar = "foo"
df3[, (myVar):=NULL] # lookup myVar contents
# Method 2a -- A safe idiom for excl...
WPF Command Line
I am trying to create a WPF application that takes command line arguments. If no arguments are given, the main window should pop up. In cases of some specific command line arguments, code should be run with no GUI and exit when finished. Any suggestions on how this should properly be done would be a...
What is the difference between sql and mysql [closed]
I am new to databases and I was wondering: What is the difference between SQL and MySQL ?
5 Answers
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How much faster is C++ than C#?
...++ code. However C++ code used to be significantly faster for a long time, and also today still is in many cases. This is mainly due to the more advanced JIT optimizations being complicated to implement, and the really cool ones are only arriving just now.
So C++ is faster, in many cases. But this ...
NodeJS: Saving a base64-encoded image to disk
...e64-encoded PNG from the browser (generated from canvas with toDataURL() ) and writing it to a file. But the file isn't a valid image file, and the "file" utility simply identifies it as "data".
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SVN Repository Search [closed]
...VN respository for code snippets? I found 'FishEye' but the cost is 1,200 and well outside my budget.
14 Answers
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Find an element in DOM based on an attribute value
...there is any DOM API which search for an element with given attribute name and attribute value:
7 Answers
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Bootstrap 3 jquery event for active tab change
...ying to fire a function when the tab changes of the bootstrap 3 tab/navbar and literally all suggestions google spat out were wrong/did not work.
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How do I comment out a block of tags in XML?
...across multiple lines (which exists also in HTML)
<detail>
<band height="20">
<!--
Hello,
I am a multi-line XML comment
<staticText>
<reportElement x="180" y="0" width="200" height="20"/>
<text><![CDATA[Hell...
Removing whitespace between HTML elements when using line breaks
...ock, or float:left on the images will let you have define your own spacing and format the HTML however you want but will affect the layout in ways that might or might not be appropriate.
Otherwise you are dealing with inline content so the HTML formatting is important - as the images will effective...