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How to unload a package without restarting R
I'd like to unload a package without having to restart R (mostly because restarting R as I try out different, conflicting packages is getting frustrating, but conceivably this could be used in a program to use one function and then another--although namespace referencing is probably a better idea fo...
How to maintain aspect ratio using HTML IMG tag
...f an img tag to 64, it's not maintaining the aspect ratio, so the image looks distorted.
9 Answers
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How to copy file from HDFS to the local file system
...0070), browse to the file you intend to copy, scroll down the page and click on download the file.
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Is it good style to explicitly return in Ruby?
Coming from a Python background, where there is always a "right way to do it" (a "Pythonic" way) when it comes to style, I'm wondering if the same exists for Ruby. I've been using my own style guidelines but I'm thinking about releasing my source code, and I'd like it to adhere to any unwritten rule...
What's the difference between HEAD^ and HEAD~ in Git?
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Rules of thumb
Use ~ most of the time — to go back a number of generations, usually what you want
Use ^ on merge commits — because they have two or more (immediate) parents
Mnemonics:
Tilde ~ is almost linear in appearance and wants to go backward in a straight line
Car...
How to center absolute div horizontally using CSS?
...ies how far to offset the margin edges from the sides of the window.
Like 'top', but specifies how far a box's right margin edge is offset to the [left/right] of the [right/left] edge of the box's containing block.
Source:
http://www.w3.org/TR/CSS2/visuren.html#position-props
Note: The ele...
Keep SSH session alive [closed]
... HostName remotehost.com
ServerAliveInterval 240
To enable sending a keep-alive signal for all hosts, place the following contents in the configuration file:
Host *
ServerAliveInterval 240
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How to set time zone of a java.util.Date?
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JJD
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answered May 23 '10 at 10:49
ZZ CoderZZ Cod...
How to define a preprocessor symbol in Xcode
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Go to your Target or Project settings, click the Gear icon at the bottom left, and select "Add User-Defined Setting". The new setting name should be GCC_PREPROCESSOR_DEFINITIONS, and you can type your definitions in the right-hand field.
Per Steph's comments, the ful...
mongodb, replicates and error: { “$err” : “not master and slaveOk=false”, “code” : 13435 }
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You have to set "slave okay" mode to let the mongo shell know that you're allowing reads from a secondary. This is to protect you and your applications from performing eventually consistent reads by accident. You can do this in the shell with:
rs.s...