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leading zeros in rails
...t.to_s.rjust(3, '0') # => '150'
another_int.to_s.rjust(5, '0') # => '00150'
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How accurately should I store latitude and longitude?
... 111 km
1 0.1 11.1 km
2 0.01 1.11 km
3 0.001 111 m
4 0.0001 11.1 m
5 0.00001 1.11 m
6 0.000001 0.111 m
7 0.0000001 1.11 cm
8 0.00000001 1.11 mm
ref : https://en.wikipedia.org/wiki/Decimal_degrees#Precision
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How to print formatted BigDecimal values?
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BigDecimal(19.0001).setScale(2, BigDecimal.RoundingMode.DOWN)
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Difference between __str__ and __repr__?
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moshezmoshez
29.7k11 gold badge1818 silver badges1313 bronze badges
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How do I redirect output to a variable in shell? [duplicate]
...the output of one as an argument in the other.
– user001
Aug 11 '14 at 0:02
3
@PhươngNguyễn, ...
rsync: difference between --size-only and --ignore-times
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111
There are several ways rsync compares files -- the authoritative source is the rsync algorithm...
Ruby/Rails: converting a Date to a UNIX timestamp
...tion for Ruby 1.8 when you have an arbitrary DateTime object:
1.8.7-p374 :001 > require 'date'
=> true
1.8.7-p374 :002 > DateTime.new(2012, 1, 15).strftime('%s')
=> "1326585600"
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How to sum a variable by group
...sum(Frequency), by = Category] )
# user system elapsed
# 0.008 0.001 0.009
Let's compare that to the same thing using data.frame and the above above:
data = data.frame(Category=c("First","First","First","Second","Third", "Third", "Second"),
Frequency=c(10,15,5,2,1...
How do I measure request and response times at once using cURL?
...tring parameters
And here is what you get back:
time_namelookup: 0.001s
time_connect: 0.037s
time_appconnect: 0.000s
time_pretransfer: 0.037s
time_redirect: 0.000s
time_starttransfer: 0.092s
----------
time_total: 0.164s
Make a Linux/Mac s...
Cannot set some HTTP headers when using System.Net.WebRequest
.... The up-side is that the reflection is abstracted away, it's still fast (.001 second in my tests), and as an extension method feels natural.
Notes
Header names are case insensitive per the RFC, http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2
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