EVAR – Moving mean value and standard deviation

Block SymbolLicensing group: STANDARD

Function Description
The EVAR block estimates the mean value mu ( $μ$ ) and standard deviation si ( $σ$ ) from the last n samples of the input signal u according to the formulas

$\begin{array}{rcl} μ_{k} & = & \frac{1}{n} \sum_{i = 0}^{n - 1} u_{k - i} \\ σ_{k} & = & \sqrt{\frac{1}{n} \sum_{i = 0}^{n - 1} u_{k - i}^{2} - μ_{k}^{2}} \end{array}$

where $k$ stands for the current sampling instant.

Input

u	Analog input of the block	Double (F64)

Outputs

mu	Mean value of the input signal	Double (F64)
si	Standard deviation of the input signal	Double (F64)

Parameter

n	Number of samples to estimate the statistical properties from $↓$ 2 $↑$ 10000000 $⊙$ 100	Long (I32)
nmax	Limit value of parameter n (used for internal memory allocation) $↓$ 10 $↑$ 10000000 $⊙$ 200	Long (I32)

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