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BODETFCOEF

Returns the gain and/or phase values for the frequency response function of a transfer function specified by its numerators and denominators.

Format

BODETFCOEF (OUTTYPE, NUMER, DENOM, FREQSTART, FREQEND, FREQARG)

Arguments

 

OUTTYPE	Flag used to determine whether to return gain data, phase data, or both. For additional information, see OUTTYPE Values.
NUMER	A 1xN array of transfer function numerators.
DENOM	A 1xN array of transfer function denominators.
FREQSTART	First frequency of requested range.
FREQEND	Last frequency of requested range.
FREQARG	Frequency count that depends on the OUTTYPE. When OUTYPE is 0,1 or 2, FREQARG is the step size. When OUTTYPE is a number between 4 and 8, FREQARG is the number of samples.

Examples

You can create Bode data with 100 logarithmically-spaced samples between .01 and 10, by writing the following command:

variable set variable=bode_log_mag real=(BODETFCOEF &   (7, {[ 0.01]},{[ 1. , 0.4 , 1.14 , 0.22]},0.01, 10., 100)

Using the OUTTYPE Key

The OUTTYPE key controls the frequencies at which Adams/View computes the Bode data. In the example above, we used OUTTYPE=7 for logarithmically-spaced gain values.

If you want to generate an array of the corresponding frequencies, write the following command:

variable set variable=log_freq real=(10**series(-2., 0.030303, 100))

To sample on a linear scale, write the following command:

variable set variable=bode_log_mag real=(BODETFCOEF     (4, {[ 0.01]},{[ 1. , 0.4 , 1.14 , 0.22]},0.01, 10., 100)

To generate the corresponding frequencies, write the following command:

variable set variable=lin_freq real=(series(0.01, 0.100909, 100))

Learn more about matrix/array functions.