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  2. Transfer function - Wikipedia

    en.wikipedia.org/wiki/Transfer_function

    Transfer function. In engineering, a transfer function (also known as system function[ 1] or network function) of a system, sub-system, or component is a mathematical function that models the system's output for each possible input. [ 2][ 3][ 4] It is widely used in electronic engineering tools like circuit simulators and control systems.

  3. Determining the number of clusters in a data set - Wikipedia

    en.wikipedia.org/wiki/Determining_the_number_of...

    Determining the number of clusters in a data set. Determining the number of clusters in a data set, a quantity often labelled k as in the k -means algorithm, is a frequent problem in data clustering, and is a distinct issue from the process of actually solving the clustering problem. For a certain class of clustering algorithms (in particular k ...

  4. MATLAB - Wikipedia

    en.wikipedia.org/wiki/MATLAB

    When creating a MATLAB function, the name of the file should match the name of the first function in the file. Valid function names begin with an alphabetic character, and can contain letters, numbers, or underscores. Variables and functions are case sensitive. [43]

  5. NaN - Wikipedia

    en.wikipedia.org/wiki/NaN

    NaN. In computing, NaN ( / næn / ), standing for Not a Number, is a particular value of a numeric data type (often a floating-point number) which is undefined as a number, such as the result of 0/0. Systematic use of NaNs was introduced by the IEEE 754 floating-point standard in 1985, along with the representation of other non-finite ...

  6. Covariance function - Wikipedia

    en.wikipedia.org/wiki/Covariance_function

    In probability theory and statistics, the covariance function describes how much two random variables change together (their covariance) with varying spatial or temporal separation. For a random field or stochastic process Z ( x) on a domain D, a covariance function C ( x , y) gives the covariance of the values of the random field at the two ...

  7. Likelihood function - Wikipedia

    en.wikipedia.org/wiki/Likelihood_function

    The likelihood function ( ) for the probability of a coin landing heads-up (without prior knowledge of the coin's fairness), given that we have observed HHT. Consider a simple statistical model of a coin flip: a single parameter that expresses the "fairness" of the coin.

  8. Complex number - Wikipedia

    en.wikipedia.org/wiki/Complex_number

    Complex number. A complex number can be visually represented as a pair of numbers (a, b) forming a vector on a diagram called an Argand diagram, representing the complex plane. Re is the real axis, Im is the imaginary axis, and i is the "imaginary unit", that satisfies i2 = −1. In mathematics, a complex number is an element of a number system ...

  9. CPF number - Wikipedia

    en.wikipedia.org/wiki/CPF_number

    A CPF number is a 11-digit number of which the first eight digits form its base. The ninth number indicates the Fiscal Region responsible for its registration. The Fiscal Regions have the following identification: [ 10] 1 – DF, GO, MS, MT and TO; 2 – AC, AM, AP, PA, RO and RR; 3 – CE, MA and PI; 4 – AL, PB, PE and RN;