abs (MATLAB Function Reference)

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絕對值與複數值

Syntax

Y = abs(X)

Description

abs(X) 回傳 X 中各元素的絕對值。

若 X 為複數， abs(X) 回傳複數值（complex magnitude）：

abs(X) = sqrt(real(X).^2 + imag(X).^2)

Examples

abs(-5) = 5
abs(3+4i) = 5

See Also

angle, sign, unwrap

Colon : acos, acosh