not enough input arguments when using function functions.

Question

Arthur 2024-6-12

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2127856-not-enough-input-arguments-when-using-function-functions

评论： Ganesh 2024-6-12

Hi, when I call heun(u0,n,dt,f), the error is:

Not enough input arguments.

Error in f (line 7)

mat = zeros(n);

Any ideas why? It's like the f function hasn't even read the parameters I put into it.

Thanks.

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Stephen23 2024-6-12

编辑：Stephen23 2024-6-12

Please show the exact code used to define the inputs u0, n, dt, and f, and exactly how you call heun. Do not edit anything to make it simpler for us, we need the exact code.

Most likely you called the function instead of defining a function handle:

https://www.mathworks.com/help/matlab/matlab_prog/creating-a-function-handle.html

Arthur 2024-6-12

Hi, that was exactly the issue. Thanks!

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Answer 1

Ganesh 2024-6-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2127856-not-enough-input-arguments-when-using-function-functions#answer_1470921

编辑：Ganesh 2024-6-12

Hi @Arthur,

The error is occuring as you are likely not passing "f" as a "function handle".

You can try calling "heun(u0,n,dt,@f)" instead.

When passing functions as arguments to another function, it is important to pass it as a function handle always. You can find more on "function handles" from the following documentation:

https://www.mathworks.com/help/matlab/matlab_prog/creating-a-function-handle.html

Edit - I just saw @Stephen23 has already answered it in comments, apologies for a repetitive answer.