Warning does not display message after message identifier

Why does "warning" not print out the message after a message identifier?

Compare the following:

>> warning('A:B:div0','0/0 operation encountered, converted to nan.') Warning: 0/0 operation encountered, converted to nan.

>> warning('A:B:0div0','0/0 operation encountered, converted to nan.') Warning: A:B:0div0 

Answer 1

[MathWorks Support Team]

Each field of the message identifier must start with a letter. In the example above, the last field of the identifier starts with a number, so MATLAB does not recognize it as a valid identifier and instead treats it as a message. The function is then called with the syntax,

>> warning(msg,A1,...,An)

where "msg" is treated as a formatted string. However, the message does not contain any formatting conversion characters (%s, %d, etc.) so the remaining argument is not displayed.

Please refer to the link below for details about the message identifier syntax:

https://www.mathworks.com/help/matlab/ref/warning.html