Control System Toolbox™

sumblk - Specify summing junctions in name-based interconnections

Syntax

S = sumblk(OUTPUT, INPUT1,...,INPUTN) S = sumblk(OUTPUTNAME,INPUT1,...,INPUTN,SIGNS)

Description

S = sumblk(OUTPUT, INPUT1,...,INPUTN) returns the transfer function S for the summing junction OUTPUT= INPUT1 + ...+ INPUTN.

S = sumblk(OUTPUTNAME,INPUT1,...,INPUTN,SIGNS) further specifies a sign for each input signal. For example, s = sumblk('e','r','y','+-') specifies the relationship e = r - y. You can use sumblk in conjunction with connect to quickly and reliably connect LTI models and derive aggregate models for block diagrams.

Input Arguments

OUTPUT: Output of the summing junction.
INPUT1,...,INPUTN: Inputs to the summing junction.

Note The output signal name(s) OUTPUT and input signal name(s) INPUT1,...,INPUTN are specified as strings for scalar-valued signals, and commensurate cell arrays of strings for vector-valued signals.

Output Arguments

S: Transfer function for the summing junction.

Examples

Specify the summing junction u = u1 + u2 + u3.

s = sumblk('u','u1','u2','u3')

Similarly, you can specify the summing junction v = u + d where u,d,v are vector-valued signals of length two.