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How do I time a method's execution in Java?
...liseconds for all tasks :\n"+sw.getTotalTimeMillis());
System.out.println("Table describing all tasks performed :\n"+sw.prettyPrint());
System.out.format("Time taken by the last task : [%s]:[%d]",
sw.getLastTaskName(),sw.getLastTaskTimeMillis());
System.out.println("\n Array of the data f...
Lock-free multi-threading is for real threading experts
...id some great work in JSR-166.
Cliff Click has an interesting take on hash tables that does not rely on lock-striping - as the Java and .NET concurrent hash tables do - and seem to scale well to 750 CPUs.
If you are not afraid to venture into Linux territory, the following article provides more ins...
PHP: How to remove all non printable characters in a string?
...SCII?
If your Tardis just landed in 1963, and you just want the 7 bit printable ASCII chars, you can rip out everything from 0-31 and 127-255 with this:
$string = preg_replace('/[\x00-\x1F\x7F-\xFF]/', '', $string);
It matches anything in range 0-31, 127-255 and removes it.
8 bit extended ASCI...
How to connect to SQL Server database from JavaScript in the browser?
...g);
var rs = new ActiveXObject("ADODB.Recordset");
rs.Open("SELECT * FROM table", connection);
rs.MoveFirst
while(!rs.eof)
{
document.write(rs.fields(1));
rs.movenext;
}
rs.close;
connection.close;
A better way to connect to a sql server would be to use some server side language like PHP,...
Are JavaScript strings immutable? Do I need a “string builder” in JavaScript?
Does javascript use immutable or mutable strings? Do I need a "string builder"?
10 Answers
...
How to hash a string into 8 digits?
...ion? He (or she) wanted (or needed) 8 decimal places. Also, the way hash tables work is to hash into a small search space (the sparse table). You seem to not know want hash functions are commonly used for and to not care about the actual question that was asked.
– Raymond He...
How can I convert JSON to CSV?
...elements are numbers or strings.
CSV can essentially represent only a 2-D table -- optionally with a first row of "headers", i.e., "column names", which can make the table interpretable as a list of dicts, instead of the normal interpretation, a list of lists (again, "leaf" elements can be numbers ...
Combine two ActiveRecord::Relation objects
...ny odd situations, by using Rails' built-in Arel.
User.where(
User.arel_table[:first_name].eq('Tobias').or(
User.arel_table[:last_name].eq('Fünke')
)
)
This merges both ActiveRecord relations by using Arel's or.
Merge, as was suggested here, didn't work for me. It dropped the 2nd set...
Reshape three column data frame to matrix (“long” to “wide” format) [duplicate]
...also sparseMatrix within the Matrix package, as seen here: R - convert BIG table into matrix by column names
with(tmp, sparseMatrix(i = as.numeric(x), j=as.numeric(y), x=z,
dimnames=list(levels(x), levels(y))))
## 2 x 3 sparse Matrix of class "dgCMatrix"
## a b c
## x 1 2 3...
What is “loose coupling?” Please provide examples
...imply modelled as dead data. in Database terms, all that is need here is a table CREATE TABLE entry (price INTEGER, quantity INTEGER)
– Jo So
Jul 9 '16 at 11:56
...