it says error using assert, assertion failed and error in iuntitled (line 10) assert(ischar(in))

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error using assert
Assertion failed
Error in iuntitled (line 10)
assert(ischar(in))
  3 comentarios
Ian
Ian el 16 de Jun. de 2022
Editada: Geoff Hayes el 17 de Jun. de 2022
heres the code
function result = encodeCharacter(in)
% Encode a single character into the 16-bit sequence for the Code 39
% barcode format.
%
% Rupert Thomas, March 2016
%
% Thanks to (for the codes): % http://notionovus.com/blog/code-39-barcode-biscuits/#setup
assert(ischar(in));
assert(length(in)==1);
codesArray = {
'1010001110111010', '1110100010101110', '1011100010101110', '1110111000101010', ... % 0, 1, 2, 3
'1010001110101110', '1110100011101010', '1011100011101010', '1010001011101110', ... % 4, 5, 6, 7
'1110100010111010', '1011100010111010', '1110101000101110', '1011101000101110', ... % 8, 9, A, B
'1110111010001010', '1010111000101110', '1110101110001010', '1011101110001010', ... % C, D, E, F
'1010100011101110', '1110101000111010', '1011101000111010', '1010111000111010', ... % G, H, I, J
'1110101010001110', '1011101010001110', '1110111010100010', '1010111010001110', ... % K, L, M, N
'1110101110100010', '1011101110100010', '1010101110001110', '1110101011100010', ... % O, P, Q, R
'1011101011100010', '1010111011100010', '1110001010101110', '1000111010101110', ... % S, T, U, V
'1110001110101010', '1000101110101110', '1110001011101010', '1000111011101010', ... % W, X, Y, Z
'1000101011101110', '1110001010111010', '1000111010111010', '1000100010001010', ... % -, ., (space), $
'1000100010100010', '1000101000100010', '1010001000100010', '1000101110111010'}; ... % /, +, %, *
strCode39 = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ-. $/+%*';
idx = strfind(strCode39,upper(in)); % Force to upper case
if any(idx)
result = codesArray{idx};
else
error('Invalid input - character not part of the Code 39 set');
end
end

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Respuestas (2)

Geoff Hayes
Geoff Hayes el 17 de Jun. de 2022
@Ian - as per the function comment, Encode a single character i. I suspect that you are passing something else i.e. a numeric value like
>> encodeCharacter(42)
Error using encodeCharacter (line 8)
Assertion failed.
Try doing
>> encodeCharacter('4')
ans =
'1010001110101110'
or any other character. Note that you can only pass in one character. If you pass in 2 or more, then a different assert will fire.

Cris LaPierre
Cris LaPierre el 17 de Jun. de 2022
That is what an assert does. If the assertion fails (here that means that in is not a char), then an error is thrown and the message 'Assertion failed.' is thrown.
% Assertion is true -> no error
in = '5';
assert(ischar(in))
% Assertion is false -> error
in = 5;
assert(ischar(in))
Error using assert
Assertion failed.
  2 comentarios
Daniel Lyddy
Daniel Lyddy el 15 de Dic. de 2023
I hate the fact that it prints "Error using assert." That misleads developers into thinking they've coded up their assert() lines incorrectly.
I just want to print my own error message. The other stuff is confusing to my end users, and should only be printed as a default if I have not provided my own error message.
Stephen23
Stephen23 el 15 de Dic. de 2023
Editada: Stephen23 el 15 de Dic. de 2023
@Daniel Lyddy: it is also strangely inconsistent: ERROR does not state "Error using error":
error('some text')
some text
MATLAB versions until at least R2021a did not include the text "Error using assert", so it is a recent change:
Apparently someone meddled in something that worked perfectly. My guess is that new text was introduced with this behavior change in R2022a:
A related topic, where someone meddled with ERROR to try and "improve" it... thus rendering it useless:

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