Well written functions check inputs to make sure the input is valid. The function ErrorCheck takes three arguments:
- a - a scalar value
- b - either a string, or a character array
- c - a square matrix (numerical array)
If the input is anything other then this, throw the error message
'Cody demonstration error'
If the input is good, simply return 23.
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Clarification: For b, with "a string" it seems you accept both string arrays and char arrays. For c, with "matrix" it seems you require a numeric array — this is different from MATLAB's definition of a "matrix".
Thank you David Verrelli. I have modified the problem description to try to reflect that.