Built-in Function arguments (step)

[Larry Blodgett]

How do I handle arguments in octave?

For example:
m=20;

K=2;

D=4;

num=[1];

denum=[m,D,K];

mfdsys=tf2sys(num,denum)

step(mfdsys) automatically supplies the other arguments and plots the  
function

Here is the more general call with all the arguments
Function File: [y, t] = step (sys, inp, tstop, n)
Step response for a linear system. The system can be discrete or  
multivariable (or both). If no output arguments are specified, step  
produces a plot or the step response data for system sys.

Inputs

sys   System data structure.
inp   Index of input being excited
tstop   The argument tstop (scalar value) denotes the time when the  
simulation should end.
n        the number of data values.

Here is the question.
What if I want to set ONLY tstop or n and use inp as internally  
generated?
Also, how would I specify inp, what does it actually mean?

Larry



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