sgrid

Generate s-plane grid of constant damping factors and natural frequencies

Syntax

sgrid
sgrid(z,wn)


Description

sgrid generates, for pole-zero and root locus plots, a grid of constant damping factors from zero to one in steps of 0.1 and natural frequencies from zero to 10 rad/sec in steps of one rad/sec, and plots the grid over the current axis. If the current axis contains a continuous s-plane root locus diagram or pole-zero map, sgrid draws the grid over the plot.

sgrid(z,wn) plots a grid of constant damping factor and natural frequency lines for the damping factors and natural frequencies in the vectors z and wn, respectively. If the current axis contains a continuous s-plane root locus diagram or pole-zero map, sgrid(z,wn) draws the grid over the plot.

Alternatively, you can select Grid from the right-click menu to generate the same s-plane grid.

Examples

Generate S-Plane Grid on Root Locus Plot

Create the following continuous-time transfer function:

$$H(s)=\frac{2s^2+5s+1}{s^2+2s+3}$$

H = tf([2 5 1],[1 2 3]);

Plot the root locus of the transfer function.

rlocus(H)

Plot s-plane grid lines on the root locus.

sgrid