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ramp function : ウィキペディア英語版
ramp function

The ramp function is a unary real function, easily computable as the mean of the independent variable and its absolute value.
This function is applied in engineering (e.g., in the theory of DSP). The name ''ramp function'' is derived from the appearance of its graph.
== Definitions ==
The ramp function ( R(x): \mathbb \rightarrow \mathbb) may be defined analytically in several ways. Possible definitions are:
* A system of equations:
*: R(x) := \begin x, & x \ge 0; \\ 0, & x<0 \end
* The max function:
*: R(x) := \operatorname(x,0)
* The mean of a straight line with unity gradient and its modulus:
*: R(x) := \frac
: this can be derived by noting the following definition of \operatorname(a,b) ,
:: \operatorname(a,b) = \frac
: for which a = x and b = 0
* The Heaviside step function multiplied by a straight line with unity gradient:
*: R\left( x \right) := xH\left( x \right)
* The convolution of the Heaviside step function with itself:
*: R\left( x \right) := H\left( x \right)
* H\left( x \right)
* The integral of the Heaviside step function:
*: R(x) := \int_^ H(\xi)\,\mathrm\xi
* Macaulay brackets:
*: R(x) := \langle x\rangle

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「ramp function」の詳細全文を読む



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