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.

This block propagates the signal quality. More information can be found in the 1.4 section.

Input

u	Analog input of the block	Double (F64)

Parameter

n	Number of samples for statistics $↓$ 2 $↑$ 10000000 $⊙$ 100	Long (I32)
nmax	Allocated size of array $↓$ 10 $↑$ 10000000 $⊙$ 200	Long (I32)

Output

mu	Mean value	Double (F64)
si	Standard deviation	Double (F64)

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