Tutorial by Topics: and

When Rust programs reach a state where a critical error has occurred, the panic! macro can be called to exit quickly (often compared, but subtly different, to an exception in other languages). Proper error handling should involve Result types, though this section will only discuss panic! and its con...

Documentation for perl's rand() function: http://perldoc.perl.org/functions/rand.html

void cv::Mat::convertTo(OutputArray m, int rtype,double alpha = 1,double beta = 0)const ParameterDetailsmoutput matrix; if it does not have a proper size or type before the operation, it is reallocatedrtypedesired output matrix type or, rather, the depth since the number of channels are the ...

Melt with melt(DT, id.vars=c(..), variable.name="CategoryLabel", value.name="Value") Cast with dcast(DT, LHS ~ RHS, value.var="Value", fun.aggregate=sum) ParameterDetailsid.varstell melt which columns to retainvariable.nametell melt what to call the column with...

All five classes in the Landau system describe asymptotic behaviour, i.e. the behaviour when the size of the problem tends to infinity. While this might look irrelevant to our – very finite – real world problems, experience has shown that behaviour of real world algorithms mirrors this infinite be...

To serve static files (Images, CSS, JS files, etc.) use the express.static middleware function. Pass the name of the directory that contains the assets to express.static to serve the files directly. (Look to the Basic Example) You can use multiple directories, simply call the express.static mult...

The trigger will be associated with the specified table or view and will execute the specified function function_name when certain events occur. Please use below link for complete overview of: Triggers: https://www.postgresql.org/docs/current/static/sql-createtrigger.html Trigger Functions...

dblink ('dbname = name_db_distance port = PortOfDB host = HostOfDB user = usernameDB password = passwordDB', 'MY QUESRY') dbname = name of the database port = Port Of the database host = Host Of the database user = username of the database password = password of the dat...

M and DAX are two building blocks of Power BI. They both are functional languages but they differ considerably and are used for very different purposes. This page shows code samples for both languages and explains their purpose. M and DAX are two building blocks of Power BI. They both are fun...

With python matplotlib you can properly make animated graphs.

Rust's standard library does not contain a proper argument parser (unlike argparse in Python), instead preferring to leave this to third-party crates. These examples will show the usage of both the standard library (to form a crude argument handler) and the clap library which can parse command-l...

The Open CV libraries can be found on the web by using a search engine. The Gotchas: If you lower your target platform below KitKat some of the OpenCV libraries will no longer function, specifically the classes related to org.opencv.android.Camera2Renderer and other related classes. You can p...

Tips: Remember to always check the /usr/ports/UPDATING file before upgrading. There might be some significant changes in programs you use or in their configuration which will break your current setup.

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