bodemag (Control Design and Simulation Module, MathScript Function)

Member of the frqrsp class.

Syntax

bodemag(SysIn, attributes)

bodemag(SysIn, attributes, [wmin wmax])

bodemag(SysIn, attributes, wlist)

[mag, wout] = bodemag(SysIn)

[mag, wout] = bodemag(SysIn, [wmin wmax])

[mag, wout] = bodemag(SysIn, wlist)

Description

Creates the Bode magnitude plot of a system model. If you do not specify an output, this function creates a plot.

Examples

Inputs

Name	Description
SysIn	Specifies a linear time-invariant (LTI) system model in transfer function, zero-pole-gain, or state-space form.
attributes	Specifies valid plot attributes. Order the plot attributes by color, point-style, and line-style. For example, 'bo-' specifies that the plot is blue, marks points with circles, and uses solid lines. attributes is a string that can take a combination of the following values: 'b' Colors the plot blue. 'c' Colors the plot cyan. 'g' Colors the plot green. 'k' Colors the plot black. 'm' Colors the plot magenta. 'r' Colors the plot red. 'y' Colors the plot yellow. '.' Marks points with dots. 'o' Marks points with circles. 'x' Marks points with crosses. '+' Marks points with plus signs. '*' Marks points with asterisks. '-' Uses solid lines. ':' Uses dotted lines. '-.' Uses dashed and dotted lines. '--' Uses dashed lines.
wmin	Specifies the initial frequency, in radians/second, this function uses to calculate the frequency response of the SysIn model. The default value is 0.001. You also can use the wlist input to specify exact frequencies instead of a range. wmin is a real scalar.
wmax	Specifies the final frequency, in radians/second, this function uses to calculate the frequency response of the SysIn model. The default value is 1000. You also can use the wlist input to specify exact frequencies instead of a range. wmax is a real scalar.
wlist	Specifies the frequency values, in radians/second, at which this function calculates the frequency response of the SysIn model. If you specify only two elements for this input, this function treats those elements as wmin and wmax. Therefore, you must specify at least three elements for the wlist input. wlist is a real vector consisting of three or more elements.

Outputs

Name	Description
mag	Returns the magnitude(s) of the SysIn model. mag is a real matrix.
wout	Returns the frequencies at which this function calculates the magnitude(s). w is a real vector.

Examples

z = 1
p = [-1, -2]
k = 0.5
SysIn = zpk(z, p, k)
bodemag(SysIn, 'g')

Related Topics

bode
rlocus
nichols
nyquist