Generate a frequency grid.
Description
This routine generates a logarithmically spaced frequency grid, which is automatically refined in some frequency regions corresponding to weakly damped modes of a given LTI system.
Syntax
grid=gen_grid(sys{,freq}) grid=gen_grid(sys{,npts}) grid=gen_grid(sys{,freq,npts})
Input arguments
sys | LTI object. |
freq | Frequency interval in rad/s. This argument is optional and the default value is computed according to the system bandwidth. |
npts | Number of frequency points. This argument is optional and the default value is npts=50. |
Output argument
grid | Frequency grid. |
Example
sys=ss(mdiag([-0.1 1;-1 -0.1],[-1 10;-10 -1]),[],[],[]);damp(sys)grid=gen_grid(sys,[0 20],20)