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Fastest way to list all primes below N
...d the smallest useful multiple of (30*pos)+a
# on tkc, then I need the index given by the product of [(30*pos)+a][(30*pos)+b]
# in general. If b < a, I need [(30*pos)+a][(30*(pos+1))+b]
d = {}
for x in offsets:
for y in offsets:
res = (x*y) % const
...
Bomb dropping algorithm
...o 0. One can proceed down the line left to right in a strategy like this:
index = 1
while index < line_length
while number_at_index(index - 1) > 0
bomb(index)
end
index++
end
# take care of the end of the line
while number_at_index(index - 1) > 0
bomb(index - 1)
end
A couple ...
SQL JOIN vs IN performance?
...ut as soon as you start using OUTER JOIN, or if you're lacking foreign key indexes, the IN might be quicker.
Marc
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What are dictionary view objects?
...this impression:
Views are "pseudo-set-like", in that they don't support indexing, so what you can do with them is test for membership and iterate over them (because keys are hashable and unique, the keys and items views are more "set-like" in that they don't contain duplicates).
You can store the...
what is the best way to convert a json formatted key value pair to ruby hash with symbol as key?
... in the symbolize_names option. See here: http://flori.github.com/json/doc/index.html (look under parse)
eg:
>> s ="{\"akey\":\"one\",\"bkey\":\"two\"}"
>> JSON.parse(s,:symbolize_names => true)
=> {:akey=>"one", :bkey=>"two"}
...
Stop setInterval
...iv,3000);
});
function updateDiv(){
$.ajax({
url: 'getContent.php',
success: function(data){
$('.square').html(data);
},
error: function(){
clearInterval(interval); // stop the interval
$.playSound('oneday.wav');
$(...
Why is using “for…in” for array iteration a bad idea?
...y.
for (var i = 0; i < a.length; i++) {
// Iterate over numeric indexes from 0 to 5, as everyone expects.
console.log(a[i]);
}
/* Will display:
undefined
undefined
undefined
undefined
undefined
5
*/
can sometimes be totally different from the other...
Find the max of two or more columns with pandas
...this difference roughly remains constant, and is due to internal overhead (indexing alignment, handling NaNs, etc).
The graph was generated using perfplot. Benchmarking code, for reference:
import pandas as pd
import perfplot
np.random.seed(0)
df_ = pd.DataFrame(np.random.randn(5, 1000))
perfplo...
MySQL: Enable LOAD DATA LOCAL INFILE
...t the option:
local-infile=1
into your [mysql] entry of my.cnf file or call mysql client with the --local-infile option:
mysql --local-infile -uroot -pyourpwd yourdbname
You have to be sure that the same parameter is defined into your [mysqld] section too to enable the "local infile" feature s...
What is the difference between named and positional parameters in Dart?
...tHttpUrl with or without the third parameter.
getHttpUrl('example.com', '/index.html', 8080); // port == 8080
getHttpUrl('example.com', '/index.html'); // port == 80
You can specify multiple positional parameters for a function:
getHttpUrl(String server, String path, [int port=80, int numR...