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Set Up Error Checking and Messages in a Function—Wolfram Documentation

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Use the same error-messaging mechanism in your functions that system functions use.

Define a function that returns a string of n asterisks, with n limited to 80. If n is too large, issue a message and limit the length to 80:

• Message names always consist of a function name and message identifier separated by a double colon (::).

Define the message, with a placeholder for the message argument:

• Messages can have more than one argument or no arguments at all.

No message:

Error message:

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