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Fast way to get image dimensions (not filesize)
...r if it reads the whole data for that though. See the manpage of exiv2 for all supported image formats.
head -n1 will give you the dimensions for PPM, PGM formats.
For formats popular on the web, both exiv2 and identify will do the job.
Depending on the use-case you may need to write your own scri...
How to delete a remote tag?
...r a branch and for a tag. If you want to make sure that you cannot accidentally remove the branch instead of the tag, you can specify full ref which will never delete a branch:
git push origin :refs/tags/tagname
If you also need to delete the local tag, use:
git tag --delete tagname
Background
Pu...
Detect Click into Iframe using JavaScript
... is cross domain. What I would like to do is track if the user clicked at all in the iframe . I imagine a scenario where there is an invisible div on top of the iframe and the the div will just then pass the click event to the iframe .
...
Copy a stream to avoid “stream has already been operated upon or closed”
...ata, then by definition you either have to generate it twice (deterministically) or store it. If it already happens to be in a collection, great; then iterating it twice is cheap.
We did experiment in the design with "forked streams". What we found was that supporting this had real costs; it bu...
What do the makefile symbols $@ and $< mean?
...e name of the target being generated, and $< the first prerequisite (usually a source file). You can find a list of all these special variables in the GNU Make manual.
For example, consider the following declaration:
all: library.cpp main.cpp
In this case:
$@ evaluates to all
$< evaluates to...
Max length for client ip address [duplicate]
...esses are 128 bits (as opposed to 32 bits of IPv4 addresses). They are usually written as 8 groups of 4 hex digits separated by colons: 2001:0db8:85a3:0000:0000:8a2e:0370:7334. 39 characters is appropriate to store IPv6 addresses in this format.
Edit: However, there is a caveat, see @Deepak's ans...
shortcut for creating a Map from a List in groovy?
...
Check out "inject". Real functional programming wonks call it "fold".
columns.inject([:]) { memo, entry ->
memo[entry.name] = entry.val
return memo
}
And, while you're at it, you probably want to define methods as Categories instead of right on the metaClass. That ...
Is there a rule-of-thumb for how to divide a dataset into training and validation sets?
...ry variance in your estimates. If you have 100,000 instances, it doesn't really matter whether you choose an 80:20 split or a 90:10 split (indeed you may choose to use less training data if your method is particularly computationally intensive).
Assuming you have enough data to do proper held-out t...
How to stop an app on Heroku?
... your app you can scale the web dynos down to zero which effectively takes all your app http-processes offline.
$ heroku ps:scale web=0
Scaling web processes... done, now running 0
share
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improve...
How can I force gradle to redownload dependencies?
...
Generally, you can refresh dependencies in your cache with the command line option --refresh-dependencies. You can also delete the cached files under ~/.gradle/caches. With the next build Gradle would attempt to download them agai...