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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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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, ...
Difference between __str__ and __repr__?
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moshezmoshez
29.7k11 gold badge1818 silver badges1313 bronze badges
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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
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time_total: 0.164s
Make a Linux/Mac s...
Python multiprocessing pool.map for multiple arguments
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Neat and elegant.
– Prav001
Aug 8 '19 at 20:53