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  2. Function (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Function_(mathematics)

    In this case, an element x of the domain is represented by an interval of the x-axis, and the corresponding value of the function, f(x), is represented by a rectangle whose base is the interval corresponding to x and whose height is f(x) (possibly negative, in which case the bar extends below the x-axis).

  3. Newton's method - Wikipedia

    en.wikipedia.org/wiki/Newton's_method

    This can be seen in the following tables, the left of which shows Newton's method applied to the above f(x) = x + x 4/3 and the right of which shows Newton's method applied to f(x) = x + x 2. The quadratic convergence in iteration shown on the right is illustrated by the orders of magnitude in the distance from the iterate to the true root (0,1 ...

  4. MATLAB - Wikipedia

    en.wikipedia.org/wiki/MATLAB

    MATLAB (an abbreviation of "MATrix LABoratory" [18]) is a proprietary multi-paradigm programming language and numeric computing environment developed by MathWorks.MATLAB allows matrix manipulations, plotting of functions and data, implementation of algorithms, creation of user interfaces, and interfacing with programs written in other languages.

  5. Fourier transform - Wikipedia

    en.wikipedia.org/wiki/Fourier_transform

    The Heisenberg group is a certain group of unitary operators on the Hilbert space L 2 (R) of square integrable complex valued functions f on the real line, generated by the translations (T y f)(x) = f (x + y) and multiplication by e i2πξx, (M ξ f)(x) = e i2πξx f (x).

  6. Simpson's rule - Wikipedia

    en.wikipedia.org/wiki/Simpson's_rule

    from collections.abc import Sequence def simpson_nonuniform (x: Sequence [float], f: Sequence [float])-> float: """ Simpson rule for irregularly spaced data.:param x: Sampling points for the function values:param f: Function values at the sampling points:return: approximation for the integral See ``scipy.integrate.simpson`` and the underlying ...

  7. Proximal operator - Wikipedia

    en.wikipedia.org/wiki/Proximal_operator

    The Proximity Operator repository: a collection of proximity operators implemented in Matlab and Python. ProximalOperators.jl: a Julia package implementing proximal operators. ODL: a Python library for inverse problems that utilizes proximal operators.

  8. Numerical differentiation - Wikipedia

    en.wikipedia.org/wiki/Numerical_differentiation

    A simple two-point estimation is to compute the slope of a nearby secant line through the points (x, f(x)) and (x + h, f(x + h)). [1] Choosing a small number h, h represents a small change in x, and it can be either positive or negative.

  9. Mean of a function - Wikipedia

    en.wikipedia.org/wiki/Mean_of_a_function

    In calculus, and especially multivariable calculus, the mean of a function is loosely defined as the average value of the function over its domain.In one variable, the mean of a function f(x) over the interval (a,b) is defined by: [1]