The warning function also allows you to control which warnings are actually printed to the screen. If the warning function is called with a string argument that is either "on" or "off" all warnings will be enabled or disabled.
It is also possible to enable and disable individual warnings through their string identifications. The following code will issue a warning
warning ("example:non-negative-variable",
"'a' must be non-negative. Setting 'a' to zero."); while the following won’t issue a warning
warning ("off", "example:non-negative-variable");
warning ("example:non-negative-variable",
"'a' must be non-negative. Setting 'a' to zero.");
© 1996–2018 John W. Eaton
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https://octave.org/doc/interpreter/Enabling-and-Disabling-Warnings.html