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

Ian
2022 6 16
2 个回答
更新时间：2023 12 15
7 次查看（30 天）

0 个投票

error using assert
Assertion failed
Error in iuntitled (line 10)
assert(ischar(in))

3 个评论
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Geoff Hayes
Geoff Hayes 2022-6-16
@Ian - did you add the assert? Or is it being called from some other piece of code? If other code, can you post the code to this question?
If in is not a character, then ischar(in) will be false and the assert is indicating this. See assert for details on how this function behaves with false input parameter.
Ian
Ian 2022-6-16
编辑：Geoff Hayes 2022-6-17
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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回答（2 个）

Geoff Hayes
Geoff Hayes 2022-6-17

0 个投票

@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 2022-6-17
Ran in:

0 个投票

Ran in:
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.

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Daniel Lyddy
Daniel Lyddy 2023-12-15
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 2023-12-15
编辑：Stephen23 2023-12-15
Ran in:
Ran in:
@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:
https://www.mathworks.com/help/matlab/release-notes.html?rntext=assert&startrelease=R2022a&endrelease=R2023b&groupby=release&sortby=descending&searchHighlight=assert
A related topic, where someone meddled with ERROR to try and "improve" it... thus rendering it useless:
https://www.mathworks.com/matlabcentral/answers/1814220-calling-the-error-function-does-not-print-the-line-number-in-r2022b

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Ian
Ian
2022-6-16

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Stephen23
Stephen23
2023-12-15

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