# Input P/Z¶

Fig. 9 shows a typical view of the **P/Z** tab where
you can view and edit the filter poles and zeros. Pole / zero values are updated
every time you design a new filter or update the coefficients.

In the top row, the display of poles and zeros can be disabled as an update can be time consuming for high order filters (\(N > 100\)).

## Cartesian format¶

Poles and zeros are displayed in cartesian format (\(x\) and y) by default as shown in Fig. 9.