Symbol z

Its job in the formula

z is part of the quantity the equation computes from the expression on the right.

Where the article explains it

The standard affine mapping takes a real value x , a scale s and a zero-point z , and produces an integer $x_q$ = $\mathrm{clip}$$\left(\left\lfloor \frac{x}{s} \right\rceil + z,\ q_{\min},\ q_{\max}\right)$, $\qquad$ $\hat{x}$ = s$\left(x_q - z\right)$ where $\lfloor$ $\cdot$ $\rceil$ is round-to-nearest and $\hat{x}$ is the dequantised approximation actually used in arithmetic.

Learn the underlying idea

A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.

Open the illustrated variables: a letter stands for a value guide →