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Loaded classes can only be unloaded in a controlled way, i.e. when the programmer wants this to happen, if the classloader used to load the class is not the system class loader, and is itself unloaded. When doing so, various details need to be observed to ensure the class is really unloaded. This makes unloading of classes tedious.
Compared to libraries in other programming languages, R packages must conform to a relatively strict specification. [3] The Writing R Extensions manual [7] specifies a standard directory structure for R source code, data, documentation, and package metadata, which enables them to be installed and loaded using R's in-built package management ...
A class library contains classes that can be used to create objects. In Java , for example, classes are contained in JAR files and objects are created at runtime from the classes. However, in Smalltalk , a class library is the starting point for a system image that includes the entire state of the environment, classes and all instantiated objects.
If every shared library that is loaded has undergone this process, then each will load at its predetermined address, which speeds up the process of dynamic linking. This optimization is known as prebinding or prelinking on macOS and Linux, respectively. IBM z/VM uses a similar technique, called "Discontinuous Saved Segments" (DCSS). [9]
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R is a programming language for statistical computing and data visualization. It has been adopted in the fields of data mining, bioinformatics and data analysis. [9] The core R language is augmented by a large number of extension packages, containing reusable code, documentation, and sample data. R software is open-source and free software.
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