Function File: S = sumblk (formula)

Function File: S = sumblk (formula, n)

Create summing junction S from string formula for name-based interconnections.

Inputs

formula

String containing the formula of the summing junction, e.g. e = r - y + d

n

Signal size. Default value is 1.

Outputs

S

State-space model of the summing junction.

Example

octave:1> S = sumblk ('e = r - y + d')

S.d =
       r   y   d
   e   1  -1   1

Static gain.
octave:2> S = sumblk ('e = r - y + d', 2)

S.d =
       r1  r2  y1  y2  d1  d2
   e1   1   0  -1   0   1   0
   e2   0   1   0  -1   0   1

Static gain.

See also: connect.

Package: control