chgTimeUnit
Change time units of dynamic system
Description
changes the
time units of sys_new
=
chgTimeUnit(sys
,newtimeunits
)sys
to newtimeunits
without
modifying system behavior. The time- and frequency-domain characteristics of
sys
and sys_new
match.
Examples
Change Time Units of Dynamic System Model
Create a transfer function model.
num = [4 2]; den = [1 3 10]; sys = tf(num,den);
By default, the time unit of sys
is 'seconds'
. Create a new model with the time units changed to minutes.
sys1 = chgTimeUnit(sys,'minutes');
This command sets the TimeUnit
property of sys1
to 'minutes'
, without changing the dynamics. To confirm that the dynamics are unchanged, compare the step responses of sys
and sys1
.
stepplot(sys,'r',sys1,'y--'); legend('sys','sys1');
The step responses are the same.
If you change the TimeUnit
property of the system instead of using chgTimeUnit
, the dynamics of the system do change. To see this, change the TimeUnit
property of a copy of sys
and compare the step response with the original system.
sys2 = sys; sys2.TimeUnit = 'minutes'; stepplot(sys,'r',sys2,'gx'); legend('sys','sys2');
The step responses of sys
and sys2
do not match. For example, the original rise time of 0.04 seconds changes to 0.04 minutes.
Input Arguments
sys
— Dynamic system model
dynamic system model
Dynamic system model, specified as one of the following model types: numeric LTI models, sparse state-space models, LTV and LPV models, and generalized LTI models. For information regarding specific model types see Dynamic System Models.
newtimeunits
— New units of time
'seconds'
(default) | 'nanoseconds'
| 'microseconds'
| 'milliseconds'
| 'minutes'
| 'hours'
| 'days'
| 'weeks'
| 'months'
| 'years'
New time units, specified as one of the following values:
'nanoseconds'
'microseconds'
'milliseconds'
'seconds'
'minutes'
'hours'
'days'
'weeks'
'months'
'years'
Output Arguments
sys_new
— Dynamic system model
dynamic system model
Dynamic system model of the same type as
sys
. The time response of sys_new
is the
same as sys
.
Version History
Introduced in R2011a
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