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When to use symbols instead of strings in Ruby?
...this:
require 'benchmark'
require 'haml'
str = Benchmark.measure do
10_000.times do
Haml::Engine.new('%input{type: "checkbox"}').render
end
end.total
sym = Benchmark.measure do
10_000.times do
Haml::Engine.new('%input{type: :checkbox}').render
end
end.total
puts "String: " + str....
Update one MySQL table with values from another
...wired00! This works perfectly. The tables are quite large (original is 100,000+ entries and tobeupdated 10,000+), so I took your and noodl's advice about the indexes and the whole query now finishes in under a second. I can't believe the difference!? Thanks so much for your help; I've learnt a lot!
...
read.csv warning 'EOF within quoted string' prevents complete reading of file
...bs. of 13 variables:
## $ row.names : chr "10.2307/675394" "10.2307/30007362" "10.2307/4254931" "10.2307/20537934" ...
## $ id : chr "10.2307/675394\t" "10.2307/30007362\t" "10.2307/4254931\t" "10.2307/20537934\t" ...
## $ doi : chr "Archaeological Inference and Inductiv...
Excel to CSV with UTF8 encoding [closed]
... Uhhh. I just had a shiver down my back. What if your excel file has 200,000 lines? Or contains sensitive data you do not want to include in an excel spreadsheat? Use Openoffice/Libreoffice if you need to.
– Seb
Oct 2 '14 at 8:48
...
How to estimate how much memory a Pandas' DataFrame will need?
...l memory consumption:
>>> df.memory_usage(index=True).sum()
731731000
Also, passing deep=True will enable a more accurate memory usage report, that accounts for the full usage of the contained objects.
This is because memory usage does not include memory consumed by elements that are not c...
Why Choose Struct Over Class?
...measure("class (10 fields)") {
var x = Int10Class(0)
for _ in 1...10000000 {
x = x + Int10Class(1)
}
}
// Measure Int10Struct
measure("struct (10 fields)") {
var y = Int10Struct(0)
for _ in 1...10000000 {
y = y + Int10Struct(1)
}
}
func measure(name: String,...
Which is faster: Stack allocation or Heap allocation
...ck it would give you a Stack Overflow. Try for example in C++ this: int t[100000000]; Try for example t[10000000] = 10; and then cout << t[10000000]; It should give you a stack overflow or just won't work and won't show you anything. But if you allocate the array on the heap: int *t = new int[...
What are the alternatives now that the Google web search API has been deprecated? [closed]
...oS on my web page that every person that visits that page has to give me $10000. Can I enforce this ToS on my visitors? Will the have to may me immediately.
– InTheNameOfScience
Nov 25 '13 at 22:13
...
Fastest Way of Inserting in Entity Framework
... }
}
return context;
}
I have a test program which inserts 560.000 entities (9 scalar properties, no navigation properties) into the DB. With this code it works in less than 3 minutes.
For the performance it is important to call SaveChanges() after "many" records ("many" around 100 or 1...
What are the differences between Perl, Python, AWK and sed? [closed]
...ange from a?ⁿaⁿ to a??ⁿaⁿ then run that in Perl 5 with an ⁿ of 1,000,000 it runs in less than two seconds. time perl -E '$x=1_000_000;$_="a"x$x;$m=("a??"x$x).("a"x$x);say $_=~$m' If you run the naive one it takes more than two seconds for an ⁿ of just 25. The thing you have to realize is...