MathLab 2019 backward compatibility

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andrew boar 2019-12-4

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https://ww2.mathworks.cn/matlabcentral/answers/494798-mathlab-2019-backward-compatibility

评论： andrew boar 2019-12-5

The following code compiles and runs fine in '9.7.0.1216025 (R2019b) Update 1'

function approx = test3(x,N)
    approx = zeros(N,1);
    approx(1) = x + 1;
    for i = 2:N
        approx(i) = approx(i - 1) + x^i / factorial(i);
    end
end

However, when I try and run it in my 2017 Uni environment, I get the following error:

Output argument "output" (and maybe others) not assigned
during call to "factorial".
 
Error in test3 (line 5)
    approx(i) = approx(i - 1) + (x^i) / factorial(i);

Any ideas please?

回答（1 个）

J. Alex Lee 2019-12-4

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/494798-mathlab-2019-backward-compatibility#answer_404699

is it possible that in your 2017 environment, you have inadvertently overloaded the "factorial" function?

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Sean de Wolski 2019-12-4

Yes. This is the default one that ships with MATLAB that you're probably intending to call but aren't:

C:\Program Files\MATLAB\R2017a\toolbox\matlab\specfun\factorial.m

The other three in matlabroot are overloaded ones for those specific data types. The one in OneDrive is shadowing the specfun one that you're intending to call. Rename the OneDrive one to myFactorial or something to avoid the conflict.

andrew boar 2019-12-5