Specifications

5 Arrays of LTI Models
5-26
Note that:
•Each model in
sys1 and sys2 must have the same number of inputs and
outputs. This is required for the addition of two LTI arrays.
•Thelengthsofthearraydimensionsof
sys1 and sys2 must match.
Dimension Requirements
In general, when you apply any of these basic operations to two or more LTI
arrays:
•The I/O dimensions of each of the LTI arrays must be compatible with the
requirements of the operation.
•The lengths of array dimensions must match.
The I/O dimensionsof each modelintheresultingLTIarrayaredetermined by
theoperation beingperformed. See Chapter 3, “Operationson LTI Models,”for
requirements on the I/O dimensions for the various operations.
For example, if
sys1 and sys2 are both 1-by-3 arrays of LTI models with two
inputs and two outputs, and
sys3 is a 1-by-3 array of LTI models with two
outputs and 1 input, then
sys1 + sys2
is an LTI array with the same dimensions as sys1 and sys2.
sys1 * sys3
is a 1-by-3 array of LTI models with two outputs and one input, and
[sys1,sys3]
is a 1-by-3 array of LTI models with two outputs and three inputs.
Special Cases for Operations on LTI Arrays
There are some special cases in coding operations on LTI arrays.
Consider
sysa = op(sys1,sys2)
where op is a symbol for the operation being applied. sys1 is an LTIarray, and
sysa (the result of the operation) is an LTI array with the same array