echo (MATLAB Function Reference)

Echo M-files during execution

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.