Optional Input Ports - 2022.1 English

This example shows how to use the parameter passing mechanism of MCode blocks to specify whether or not to use optional input ports on MCode blocks.

The following M-code, which defines M-function xl_m_addsub is contained in file xl_m_addsub.m:

function s = xl_m_addsub(a, b, sub)
  if sub
    s = a - b;
  else
    s = a + b;
  end

The following diagram shows a Subsystem containing two MCode blocks that use M-function xl_m_addsub.

The labeled add is shown in below.

As a result, the add block features two input ports a and b; it performs full precision addition. Input parameter sub of the MCode block labeled addsub is not bound with any value. Consequently, the addsub block features three input ports: a, b, and sub; it performs full precision addition or subtraction based on the value of input port sub.