Scilab Website | Contribute with GitLab | Mailing list archives | ATOMS toolboxes
Scilab Online Help
5.5.2 - English

Change language to:
Français - 日本語 - Português - Русский

Please note that the recommended version of Scilab is 2024.1.0. This page might be outdated.
See the recommended documentation of this function

Scilab Help >> CACSD (Computer Aided Control Systems Design) > Plot and display > sgrid


s-plane grid lines.

Calling Sequence

sgrid(zeta,wn [,colors])
sgrid(['new',] zeta,wn [,colors])
sgrid(zeta,wn [,'new'] [,colors])



array of damping factors. Only values in [0 1] are taken into account. The default value is [0 0.16 0.34 0.5 0.64 0.76 0.86 0.94 0.985 1] .


array of natural frequencies in Hz. only positive values are taken into account. If not given it is computed by the program to fit with the boundaries of the plot.


a scalar or an 2 element array with integer values (color index).


Plots selected curves of constant damping ratio (selection given by zeta) and constant natural frequency (selection given by wn).

The colors argument may be used to assign a color for constant damping ratio curves (colors(2)) and for constant natural frequency curves (colors(1)).

The sgrid function is often used to draw a grid for evens root locus of continuous time linear systems. In such a case the sgrid function should be called after the call to evans. For discrete time linear systems one should use zgrid function instead.

The optional argument 'new' can be used to erase the graphic window before plotting the grid.


clf();sgrid(0:0.2:1,[0.2 0.6 1 1.7 2])


See Also

  • evans — Evans root locus
  • zgrid — zgrid plot
  • datatips — Tool for placing and editing tips along the plotted curves.
Report an issue
<< phaseplot Plot and display show_margins >>

Copyright (c) 2022-2024 (Dassault Systèmes)
Copyright (c) 2017-2022 (ESI Group)
Copyright (c) 2011-2017 (Scilab Enterprises)
Copyright (c) 1989-2012 (INRIA)
Copyright (c) 1989-2007 (ENPC)
with contributors
Last updated:
Wed Apr 01 10:13:54 CEST 2015