echo

Echo M-files during execution

Syntax

• echo on
  echo off
  echo
  echo fcnname on
  echo fcnname off
  echo fcnname
  echo on all
  echo off all
  

Description

The echo command controls the echoing of M-files during execution. Normally, the commands in M-files do not display on the screen during execution. Command echoing is useful for debugging or for demonstrations, allowing the commands to be viewed as they execute.

The echo command behaves in a slightly different manner for script files and function files. For script files, the use of echo is simple; echoing can be either on or off, in which case any script used is affected.

echo on	Turns on the echoing of commands in all script files.
echo off	Turns off the echoing of commands in all script files.
echo	Toggles the echo state.

With function files, the use of echo is more complicated. If echo is enabled on a function file, the file is interpreted, rather than compiled. Each input line is then displayed as it is executed. Since this results in inefficient execution, use echo only for debugging.

echo fcnname on	Turns on echoing of the named function file.
echo fcnname off	Turns off echoing of the named function file.
echo fcnname	Toggles the echo state of the named function file.
echo on all	Set echoing on for all function files.
echo off all	Set echoing off for all function files.