Instead its type was struct.
The default error messages use the generic term input to refer to the argument that failed
validation. When you use the default error message, the only way to determine which input failed is
to view the specified line of code in checkme.
Add Input Name and Position to Errors
Define a function in a file named checkdetails.m that performs the same validation as checkme,
but adds details about the input name and position to the error messages.
function checkdetails(a,b,c)
validateattributes(a,{'double'},{'positive','2d'},'','First',1)
validateattributes(b,{'numeric'},{'numel',100,'ncols',10},'','Second',2)
validateattributes(c,{'char'},{'nonempty'},'','Third',3)
disp('All inputs are ok.')
The empty character vector '' for the fourth input to validateattributes is a placeholder for an
optional function name. You do not need to specify a function name because it already appears in the
error message. Specify the function name when you want to include it in the error identifier for
additional error handling.
Call checkdetails with invalid inputs.
checkdetails(-4)
Error using checkdetails (line 3)
Expected input number 1, First, to be positive.
checkdetails(pi,rand(3,4,2))
Error using checkdetails (line 4)
Expected input number 2, Second, to be an array with
number of elements equal to 100.
See Also
validateattributes | validatestring
21 Function Arguments
21-12