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What is the difference between Gemfile and Gemfile.lock in Ruby on Rails
...versions in some cases (e.g. rails (4.0.0) requires bundler (>= 1.3.0, < 2.0)), which causes problems. Any idea how to avoid those 'open' dependencies?
– Guillermo Grau
Apr 4 '14 at 9:23
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How to get current location in Android [duplicate]
...on on the Manifest,
For using only network based location use this one
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
For GPS based location, this one
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
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Count, size, length…too many choices in Ruby?
...s size) rather than count if you want to know how many elements there are altogether.
Regarding ActiveRecord, on the other hand, there are important differences. check out this post:
Counting ActiveRecord associations: count, size or length?
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What's “tools:context” in Android layout files?
...s attribute declares which activity this layout is associated with by default. This enables features in the editor or layout preview that require knowledge of the activity, such as what the layout theme should be in the preview and where to insert onClick handlers when you make those from a quickfix...
Easiest way to copy a single file from host to Vagrant guest?
...l via:
vagrant plugin install vagrant-scp
Use it like so:
vagrant scp <some_local_file_or_dir> [vm_name]:<somewhere_on_the_vm>
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What is a void pointer in C++? [duplicate]
...ot dereference pVoid because it is a void pointer
int *pInt = static_cast<int*>(pVoid); // cast from void* to int*
cout << *pInt << endl; // can dereference pInt
Source: link
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Using python “with” statement with try-except block
... line = f.readline()
finally:
f.close()
except IOError:
<whatever>
As you can see, the with statement can make things less error prone. In newer versions of Python (2.7, 3.1), you can also combine multiple expressions in one with statement. For example:
with open("input", ...
Pairwise crossproduct in Python [duplicate]
...> a=[1,2,3]
>>> b=[4,5,6]
>>> itertools.product(a,b)
<itertools.product object at 0x10049b870>
>>> list(itertools.product(a,b))
[(1, 4), (1, 5), (1, 6), (2, 4), (2, 5), (2, 6), (3, 4), (3, 5), (3, 6)]
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Searching word in vim?
...
like this:
/\<word\>
\< means beginning of a word, and \> means the end of a word,
Adding @Roe's comment:
VIM provides a shortcut for this. If you already have word on screen and you want to find other instances of it, you ...
How to access the last value in a vector?
...rn x[n-1]; }')
options(width=100)
for (n in c(1e3,1e4,1e5,1e6,1e7)) {
x <- runif(n);
print(microbenchmark::microbenchmark(x[length(x)],
mylast(x),
tail(x, n=1),
dplyr::last(x),...