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  2. Stepped reckoner - Wikipedia

    en.wikipedia.org/wiki/Stepped_reckoner

    The stepped reckoner was based on a gear mechanism that Leibniz invented and that is now called the Leibniz wheel. It is unclear how many different variants of the calculator were made. Some sources, such as the drawing to the right, show a 12-digit version. [5] This section describes the surviving 16-digit prototype in Hanover. Leibniz wheel

  3. TI-36 - Wikipedia

    en.wikipedia.org/wiki/TI-36

    TI-36 SOLAR was based on 1985 version of TI-35 PLUS, but incorporates solar cells. It addition to standard features such as trigonometric functions, exponents, logarithm , and intelligent order of operations found in TI-30 and TI-34 series of calculators, it also include base (decimal, hexadecimal , octal , binary ) calculations, complex values ...

  4. Scientific calculator - Wikipedia

    en.wikipedia.org/wiki/Scientific_calculator

    A scientific calculator is an electronic calculator, either desktop or handheld, designed to perform calculations using basic (addition, subtraction, multiplication, division) and advanced (trigonometric, hyperbolic, etc.) mathematical operations and functions.

  5. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    When a calculator is powered on, it scans the keypad waiting to pick up an electrical signal when a key is pressed. Encoder unit Converts the numbers and functions into binary code. X register and Y register They are number stores where numbers are stored temporarily while doing calculations.

  6. Compositional data - Wikipedia

    en.wikipedia.org/wiki/Compositional_data

    In probability and statistics, a partition of the sampling space into disjoint events is described by the probabilities assigned to such events. The vector of D probabilities can be considered as a composition of D parts. As they add to one, one probability can be suppressed and the composition is completely determined.

  7. Slide rule - Wikipedia

    en.wikipedia.org/wiki/Slide_rule

    Slide the slide until the number on the D scale which is against 1 on the C cursor is the same as the number on the B cursor which is against the base number on the A scale. (Examples: A 8, B 2, C 1, D 2; A 27, B 3, C 1, D 3.)

  8. Calculator input methods - Wikipedia

    en.wikipedia.org/wiki/Calculator_input_methods

    The simplest example given by Thimbleby of a possible problem when using an immediate-execution calculator is 4 × (−5). As a written formula the value of this is −20 because the minus sign is intended to indicate a negative number, rather than a subtraction, and this is the way that it would be interpreted by a formula calculator.

  9. Windows Calculator - Wikipedia

    en.wikipedia.org/wiki/Windows_Calculator

    A simple arithmetic calculator was first included with Windows 1.0. [5]In Windows 3.0, a scientific mode was added, which included exponents and roots, logarithms, factorial-based functions, trigonometry (supports radian, degree and gradians angles), base conversions (2, 8, 10, 16), logic operations, statistical functions such as single variable statistics and linear regression.