— Function File: clsys = sysconnect (sys, out_idx, in_idx, order, tol)

Close the loop from specified outputs to respective specified inputs

Inputs

sys

System data structure.

out_idx

in_idx

Names or indices of signals to connect (see sysidx). The output specified by out_idx(ii) is connected to the input specified by in_idx(ii).

order

logical flag (default = 0)

0

Leave inputs and outputs in their original order.

1

Permute inputs and outputs to the order shown in the diagram below.

tol

Tolerance for singularities in algebraic loops, default: 200eps.

Outputs

clsys

Resulting closed loop system.

Method

sysconnect internally permutes selected inputs, outputs as shown below, closes the loop, and then permutes inputs and outputs back to their original order

          --------------------
          u_1       ----->|                  |----> y_1
          |        sys       |
          old u_2 |                  |
          u_2* ---->(+)--->|                  |----->y_2
          (in_idx)   ^     --------------------    | (out_idx)
          |                             |
          -------------------------------

The input that has the summing junction added to it has an * added to the end of the input name.