computer science

S-PLUS

S-PLUS is a computer science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand S-PLUS rather than just read about it. In short: S-PLUS was a commercial implementation of the S programming language sold by TIBCO Software Inc. It features object-oriented programming capabilities and advanced analytical algorithms.

Key takeaways

S-PLUS belongs to computer science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect S-PLUS to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of S-PLUS from memory before moving on to harder problems.

Reference excerpt

S-PLUS was a commercial implementation of the S programming language sold by TIBCO Software Inc. It features object-oriented programming capabilities and advanced analytical algorithms. Its statistical analysis capabilities are commonly used by econometricians. The S-PLUS FinMetrics software package was developed for econometric time series analysis. Due to the increasing popularity of the open source S successor R, TIBCO Software released the TIBCO Enterprise Runtime for R (TERR) as an alternative R interpreter. It is available on Windows and UNIX operating systems.

Historical timeline

Source: In 1988, S-PLUS was first developed and released by a Seattle-based start-up company called Statistical Sciences, Inc. The company's founder and sole owner was R. Douglas Martin, professor of statistics at the University of Washington, Seattle. Martin originally learned S while working at Bell Laboratories, where the S language was originally developed. At the time of its release, S-PLUS was one of the first examples of software that implemented algorithms for generalized linear models, second to GLIM. Statistical Sciences acquired the exclusive license to distribute S and merged with MathSoft in 1993, becoming the firm's Data Analysis Products Division (DAPD). In 1995, S-PLUS 3.3 for Windows 95/NT was released, including the Matrix library, command history capability, and Trellis graphics. This was followed by the release of S-PLUS 3.4 for UNIX in 1996. This version included a non-linear mixed-effects modeling library, hexagonal binning, and cluster methods. S-PLUS 4 was released for Windows in 1997, with features such as an updated GUI, integration with Excel, and editable graphics. S-PLUS 4.5 for Windows in 1998, with Scatterplot brushing, and the ability to create S-PLUS graphs from within Excel & SPSS. The software also became available for Linux & Solaris. In 1999, S-PLUS 5 was released for Solaris, Linux, HP-UX, AIX, IRIX, and DEC Alpha. S-PLUS 2000 for Windows. nlme 3.3, quality control charting, and new commands for data manipulation. This was followed by S-PLUS 6 for Linux/Unix in 2000. This version had a Java-based GUI, Graphlets, survival5, and a library for handling missing data. In 2001, MathSoft sold its Cambridge-based Engineering and Education Products Division (EEPD), was renamed Insightful Corporation, and moved headquarters to Seattle. This essentially reversed the previous merger between MathSoft and Statistical Sciences, Inc. S-PLUS Analytic Server 2.0. S-PLUS 6 was released for Windows in 2001. In 2002, StatServer 6 was released and the student edition of S-PLUS became free. S-PLUS 6.2 was released and ported to AIX. In 2004, Insightful purchased the S language from Lucent Technologies for $2 million, and released S+ArrayAnalyzer 2.0. S-PLUS 7.0 was released in 2005, including the BigData library for working with larger-than-memory data sets and the S-PLUS Workbench (Eclipse development tool). Insightful Miner 7.0 was also released. In 2007, S-PLUS 8 was released with a new package system, language extensions for R package compatibility, and a workbench debugger. TIBCO acquired Insightful Corporation for $25 million in 2008. On 31st January 2026, TIBCO officially retired the product.

Worked examples

Example 1 — a first encounter with S-PLUS

Start with the simplest possible case. Write down what S-PLUS claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In computer science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to S-PLUS before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about S-PLUS ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of S-PLUS

In research: S-PLUS appears in computer science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses S-PLUS in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: S-PLUS is common in secondary-school and first-year university syllabi. It links to neighbouring topics Programming languages, Proprietary commercial software for Linux, Statistical software, so understanding it makes those chapters shorter.
In everyday life: Look for S-PLUS outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study S-PLUS in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what S-PLUS means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain S-PLUS out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is S-PLUS in simple terms?

S-PLUS was a commercial implementation of the S programming language sold by TIBCO Software Inc. It features object-oriented programming capabilities and advanced analytical algorithms.

Why does S-PLUS matter?

Because it connects several computer science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study S-PLUS?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on S-PLUS.